Extradural Haemorrhage (Epidural Haematoma)

1. Topic Overview (Clinical Overview)

Summary

Extradural Haemorrhage (EDH), also known as epidural haematoma, is a neurosurgical emergency characterised by arterial bleeding between the skull and the outer layer of the dura mater. It most commonly results from blunt head trauma causing laceration of the middle meningeal artery (MMA) following temporal bone fracture at the pterion (the thinnest part of the skull). [1,2]

The classic presentation is the "lucid interval" - a brief period of initial loss of consciousness following impact, apparent recovery to normal or near-normal function, followed by rapid neurological deterioration over minutes to hours as the haematoma expands and causes mass effect with uncal herniation. [3] This pattern is observed in approximately 20-50% of cases and is pathognomonic when present. [3]

On non-contrast CT head, EDH appears as a biconvex (lentiform or "lemon-shaped") hyperdense collection that does NOT cross suture lines (the dura is firmly adherent to the skull at suture lines). [4] The ipsilateral pupil becomes fixed and dilated due to compression of the oculomotor nerve (CN III) against the tentorial edge during uncal herniation. This is followed by contralateral hemiparesis, declining GCS, and ultimately brainstem compression with Cushing's triad and death if untreated. [5]

Emergency craniotomy with haematoma evacuation is life-saving. [6] When performed before irreversible brainstem injury occurs, outcomes are excellent with near-complete recovery expected in most cases. [7] However, delayed recognition results in the "talk and die" phenomenon - patients who are initially conscious but deteriorate and die before definitive treatment. [8]

EDH represents 1-4% of all head injuries but accounts for a disproportionate number of preventable traumatic deaths. [1,2] Rapid identification, urgent neurosurgical referral, and expedited surgical intervention are critical to preventing mortality and severe disability.

Key Facts

Clinical Pearls

"Lemon vs. Banana": EDH = Biconvex (lemon-shaped). Subdural = Crescent (banana-shaped).

"Does NOT cross sutures": The dura is tightly adherent to the skull at suture lines, limiting spread of EDH. This creates the characteristic biconvex morphology.

"Lucid interval = High index of suspicion": Any patient with head trauma who was briefly unconscious, recovered, then deteriorates requires urgent CT and neurosurgical assessment. However, absence of lucid interval does NOT exclude EDH - only 20-50% exhibit this classic pattern. [3]

"Blown pupil is ipsilateral": The dilated pupil is on the SAME side as the EDH. CN III is compressed against the tentorial edge during uncal herniation of the ipsilateral temporal lobe.

"Pterion = Most vulnerable": The pterion (where frontal, parietal, temporal, and sphenoid bones meet) is the thinnest part of the skull and directly overlies the anterior division of the middle meningeal artery. Lateral blows to the temple commonly fracture this region.

"Arterial bleeding = Rapid deterioration": EDH is typically arterial (MMA), resulting in rapid accumulation of blood and fast clinical decline - minutes to hours rather than days.

"GCS monitoring is life-saving": Serial GCS assessments every 15-30 minutes detect early deterioration. A drop of ≥2 points mandates immediate imaging and neurosurgical review.

Why This Matters Clinically

EDH is one of the most treatable neurosurgical emergencies. Unlike diffuse axonal injury or primary brainstem injury, the brain parenchyma is often intact - the pathology is a compressive mass lesion that can be evacuated surgically. Prompt recognition and surgery can result in complete neurological recovery. [7]

However, delay is catastrophic. Once uncal herniation occurs and brainstem compression develops, the injury may become irreversible despite surgical evacuation. The "golden hour" concept applies - time to surgery directly correlates with outcome.

This topic is high-yield for:

• Emergency Medicine: Recognition, initial resuscitation, and urgent referral
• Neurosurgery: Surgical indications, technique, and post-operative management
• Intensive Care: Management of raised ICP, prevention of secondary brain injury
• Radiology: CT interpretation, differentiation from subdural haematoma

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2. Epidemiology

Incidence and Prevalence

Extradural haemorrhage accounts for 1-4% of all traumatic brain injuries and approximately 5-15% of fatal head injuries. [1,2] Despite its relative rarity, EDH is a leading cause of preventable traumatic death.

Key epidemiological features:

Age-Related Patterns

Infants and Young Children (less than 2 years):

• EDH is rare due to skull pliability (force dissipated rather than causing fracture) and tight dural adherence
• When it occurs, often associated with cephalhaematoma
• Non-accidental injury should be considered [9]

Young Adults (20-30 years):

• Peak incidence
• Mechanism: Road traffic collisions, assaults, falls, sports injuries
• Skull is thin at pterion but dura is less adherent than extremes of age

Elderly (> 60 years):

• Uncommon
• Dura becomes increasingly adherent to skull with age
• Brain atrophy creates larger subarachnoid space - "buffering" effect reduces acute mass effect
• When EDH occurs in elderly, often venous rather than arterial

Mechanism of Injury

Common mechanisms: [1,2]

Location of impact:

• Temporal region (pterion): 60-70% of cases - classic MMA injury [1]
• Frontal region: 10-15% - often frontal branch of MMA or anterior ethmoidal artery
• Occipital region: 10-15% - often venous (transverse or sigmoid sinus injury)
• Vertex: Rare - superior sagittal sinus injury (venous)

Geographic and Temporal Variation

EDH incidence parallels traumatic brain injury patterns:

• Higher in countries with high rates of road traffic collisions
• Increased in regions with limited motorcycle helmet legislation
• Seasonal variation: Higher in summer months (increased outdoor activity, sports, motorcycle use)

Outcomes and Prognosis

Glasgow Outcome Scale (GOS) at 6 months: [7]

Key prognostic factors: [7]

• Time from injury to surgery (less than 4 hours optimal)
• Pre-operative GCS (single most important predictor)
• Pupillary reactivity (fixed dilated pupils poor prognostic sign)
• Haematoma volume (> 30ml associated with worse outcomes)
• Presence of associated brain injuries (contusions, diffuse axonal injury)

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3. Anatomy & Pathophysiology

Surgical Anatomy of the Pterion

The pterion is the H-shaped suture junction where four bones meet:

Clinical significance:

• Thinnest part of the skull (as thin as 2-3mm in adults)
• Overlies the anterior division of the middle meningeal artery as it runs in a groove on the inner skull surface
• Located approximately 3-4cm superior to the zygomatic arch and 3-4cm posterior to the frontal process of the zygoma (anatomical landmarks for surgical approach)
• Lateral trauma to the temple directly impacts this vulnerable region [2]

Middle Meningeal Artery (MMA)

Origin and course:

Anatomical vulnerability:

• The artery runs in a bony groove or sometimes a bony canal on the inner skull surface
• Temporal bone fractures directly lacerate the vessel as bone fragments shear through the arterial wall
• Arterial bleeding (systemic pressure 70-100mmHg) results in rapid accumulation of blood (unlike venous subdural haematoma)

Other Bleeding Sources (10-15% of cases) [1]

Haematoma Formation and Dynamics

Stages of EDH development:

1. Initial Impact and Fracture

• Blunt force to temporal region
• Temporal bone fracture (linear or depressed)
• Laceration of middle meningeal artery
• Immediate arterial bleeding into potential space between dura and skull

2. Dural Stripping

• The dura is normally tightly adherent to the inner skull surface
• Accumulating blood strips the dura away from the skull, creating the extradural space
• Dura is firmly attached at suture lines - blood cannot easily cross these boundaries
• This anatomical constraint creates the biconvex (lentiform) shape characteristic of EDH [4]

3. Haematoma Expansion

• Arterial pressure drives rapid blood accumulation (typical MMA pressure ~70mmHg)
• Volume increases exponentially in early phase (first 1-3 hours)
• As haematoma enlarges, it creates mass effect on underlying brain
• Expansion continues until arterial pressure equals resistance of stripped dura and surrounding structures

4. Mass Effect and Raised ICP

• The haematoma acts as a space-occupying lesion
• Monro-Kellie doctrine: Skull is a fixed rigid compartment containing brain (80%), blood (10%), and CSF (10%). Addition of haematoma volume MUST be compensated by reduction in other components
• Initial compensation: Venous blood and CSF displaced from intracranial compartment
• Once compensatory mechanisms exhausted: Intracranial pressure (ICP) rises exponentially
• Normal ICP: 5-15mmHg. Critical ICP: > 20-25mmHg sustained

5. Herniation Syndromes

• Expanding temporal haematoma causes uncal herniation (see below)
• Other herniation patterns possible depending on EDH location:
  • "Subfalcine herniation: Midline shift pushes cingulate gyrus under falx cerebri"
  • "Central transtentorial herniation: Bilateral downward pressure pushes brainstem through tentorial opening"
  • "Tonsillar herniation: Downward pressure pushes cerebellar tonsils through foramen magnum (terminal event)"

Uncal Herniation: Pathophysiological Stages

Uncal herniation is the most common herniation syndrome in EDH due to the typical temporal location of the haematoma. [5]

Stage 1: Early Third Nerve Compression

Stage 2: Lateral Midbrain Compression

Stage 3: Brainstem Compression and Ischaemia

Cushing's Triad: Physiology

Cushing's triad is a late and ominous sign of raised intracranial pressure with brainstem compression:

Clinical importance:

• Presence of Cushing's triad indicates impending brainstem death
• Represents failure of compensatory mechanisms
• Requires immediate intervention (hyperventilation, osmotic therapy, emergency surgery)
• Often indicates irreversible brainstem injury has occurred

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4. Clinical Presentation

The Classic "Lucid Interval"

The lucid interval is the pathognomonic presentation of EDH, observed in 20-50% of cases. [3] It represents the time lag between initial injury and haematoma expansion to critical volume.

Three phases:

Historical terminology:

• "Talk and Die" syndrome: Describes patients who are conscious and talking after head injury but deteriorate and die before recognition and treatment [8]
• First described in detail by Jacobson in 1986: Study of 173 patients who "talked" (GCS 13-15) after head injury but died - 38% had operable haematomas (EDH or acute SDH)
• Highlights the critical importance of vigilance in head injury assessment

Clinical significance:

• Absence of lucid interval does NOT exclude EDH (50-80% of cases have no lucid interval) [3]
• Presence of lucid interval in trauma patient mandates urgent CT even if currently asymptomatic
• Education of paramedics, emergency staff, and relatives: "Was the patient knocked out, even briefly?" is a critical history question

Symptoms

Early symptoms (during lucid interval or early expansion):

Late symptoms (established mass effect):

Signs

General examination:

Neurological examination:

Glasgow Coma Scale (GCS):

• Serial GCS monitoring is critical: Trend is more important than single value
• Decline of ≥2 points in 30 minutes is a red flag requiring immediate CT and neurosurgical review
• Pre-operative GCS is the single best predictor of outcome [7]

Pupillary examination:

Motor examination:

Cushing's Triad:

NOTE: Cushing's triad is a late and ominous sign. Do NOT wait for Cushing's triad to diagnose raised ICP - it indicates imminent death.

Atypical Presentations

EDH without lucid interval (50-80% of cases): [3]

• Patient remains unconscious from time of impact
• Often indicates larger initial impact force
• May have associated severe brain injuries (contusions, diffuse axonal injury)
• Does NOT exclude EDH - CT still mandatory

Delayed EDH:

• Initial CT shows small or absent EDH
• Expansion occurs over hours to days (venous sources more common)
• Highlights need for repeat CT if clinical deterioration occurs

Posterior fossa EDH:

• Occipital trauma → venous sinus (transverse/sigmoid) injury
• Presents with ataxia, nystagmus, cranial nerve palsies
• May have "double lucid interval" [11] - initial LOC, lucid phase, second deterioration from hydrocephalus (4th ventricle compression)

Paediatric EDH:

• Skull pliability in young children may allow dural stripping without fracture
• Haematoma may be associated with cephalohaematoma
• Lower threshold for non-accidental injury investigation

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5. Investigations

CT Head (Non-Contrast) - GOLD STANDARD

Indications for urgent CT in head injury (based on NICE guidelines):

CT findings in EDH:

Imaging protocol:

• Non-contrast CT: Haemorrhage appears hyperdense. Contrast would obscure blood.
• Bone windows: Essential to identify skull fractures.
• Axial slices: Standard. Coronal/sagittal reconstructions helpful for surgical planning.

Comparison: EDH vs. Subdural Haematoma (SDH)

Additional Imaging

CT angiography (CTA):

• Indications: To identify ongoing arterial bleeding or vascular injury
• "Spot sign": Active contrast extravasation within haematoma - predicts haematoma expansion [12]
• MMA pseudoaneurysm: Rare complication, may require endovascular embolisation [13]

MRI:

• Not used acutely (takes too long, patient requires stabilisation and urgent surgery)
• May be used in follow-up to assess for parenchymal injury, chronic changes

Laboratory Investigations

Pre-operative workup:

Reversal of anticoagulation (URGENT):

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6. Management

Principles of Management

EDH management follows a structured approach prioritising time-critical intervention:

1. ABCDE resuscitation (Advanced Trauma Life Support protocol)
2. Avoid secondary brain injury (hypoxia, hypotension, hypoglycaemia)
3. Urgent CT diagnosis
4. Immediate neurosurgical referral
5. Emergency craniotomy and haematoma evacuation [6]
6. Post-operative critical care

"Time is brain": Delay to surgery is the strongest modifiable predictor of outcome. Door-to-CT time should be less than 30 minutes. CT-to-neurosurgical referral should be immediate. Time to theatre should be less than 4 hours. [7]

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Pre-Hospital and Emergency Department Management

A - Airway:

Intubation considerations:

• Use short-acting sedative and muscle relaxant to allow neurological reassessment
• Avoid suxamethonium in crush injuries (hyperkalaemia risk)
• Avoid agents that increase ICP (ketamine controversial - now considered safe)
• Target normocapnia (PaCO₂ 35-40mmHg): Hypercapnia increases ICP; excessive hyperventilation causes cerebral vasoconstriction and ischaemia

B - Breathing:

C - Circulation:

AVOID hypotension: Single episode of SBP less than 90mmHg in severe TBI doubles mortality.

D - Disability (Neurological Assessment):

E - Exposure / Environmental:

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Medical Measures to Control ICP (Bridge to Surgery)

These interventions temporarily reduce ICP while awaiting emergency surgery. They are NOT definitive treatment.

DO NOT routinely use steroids: Dexamethasone is NOT effective in traumatic brain injury and increases mortality (CRASH trial).

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Surgical Management

Indications for emergency craniotomy: [6,14]

Absolute indications (operate immediately):

Relative indications:

• EDH 20-30ml with symptoms or progression on repeat imaging
• Posterior fossa EDH > 10ml (smaller space, rapid compression of brainstem)

Conservative (non-operative) management may be considered if ALL criteria met: [14]

• Volume less than 30ml
• Maximum thickness less than 15mm
• Midline shift less than 5mm
• GCS 15 (fully conscious)
• No focal neurological deficit
• No pupillary abnormality

Conservative management protocol:

• Neurosurgical unit admission
• Repeat CT at 6-8 hours and 24 hours
• Serial GCS and pupils every 15-30 minutes for first 24 hours, then hourly
• Immediate surgery if any deterioration
• Success rate: 70-80% of selected cases avoid surgery, but 20-30% still require delayed craniotomy [14]

Surgical technique: Craniotomy for EDH

1. Preparation:

• General anaesthesia, intubation
• Arterial line (blood pressure monitoring)
• Urinary catheter
• Position: Supine, head rotated away from lesion (for temporal EDH)
• C-spine precautions if not cleared

2. Incision and bone flap:

• Trauma flap or Question mark incision (temporal region)
• Skin incision, dissect temporalis muscle
• Burr holes (2-4) placed around haematoma
• Craniotome used to connect burr holes and create bone flap
• Bone flap elevated

3. Haematoma evacuation:

• Dura bulging and blue-tinged (blood underneath)
• Dura incised or reflected
• Extradural clot evacuated (solid and liquid components)
• Haemostasis achieved:
  • Middle meningeal artery identified and cauterised or clipped [6]
  • Bone wax applied to bleeding skull edges
  • Bipolar diathermy to dural vessels
  • Haemostatic agents (Surgicel, Floseal)

4. Inspection and closure:

• Inspect for dural breach (if present, may have subdural component or CSF leak - requires dural repair)
• Ensure complete haemostasis
• Bone flap replaced and secured (plates/screws)
• Subgaleal drain (prevent scalp haematoma)
• Temporalis muscle and skin closed in layers

5. Post-operative:

• CT head immediately post-op (confirm evacuation, exclude new bleeding)
• Transfer to ICU or neurosurgical high-dependency unit

Emergency burr hole decompression:

• In extremis situations where patient deteriorating rapidly and theatre not immediately available
• Single burr hole over haematoma can temporarily decompress [15]
• Described in remote/resource-limited settings
• NOT a substitute for definitive craniotomy - patient must still go to theatre

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Post-Operative Critical Care

Immediate post-operative management (first 24 hours):

Repeat imaging:

• CT head post-op: Immediately after surgery
• Repeat CT: If any deterioration, at 24 hours routinely

Extubation criteria:

• GCS ≥13
• Able to protect airway
• Stable ICP
• No signs of re-bleeding

Complications:

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7. Complications and Prognosis

Complications

Immediate (Peri-operative):

Early Post-operative (0-7 days):

Late Complications (Weeks to Months):

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Prognosis and Outcomes

Outcome is highly dependent on:

1. Pre-operative GCS (most important single factor) [7]
2. Time to surgery (earlier is better)
3. Pupillary reactivity (fixed dilated pupils indicate herniation - poor prognosis)
4. Haematoma volume (larger volumes worse outcomes)
5. Age (young adults better than elderly)
6. Associated brain injuries (isolated EDH better than EDH + contusions/DAI)

Glasgow Outcome Scale (GOS) at 6-12 months: [7]

Specific prognostic indicators:

Mortality:

Functional outcomes in survivors:

• GCS 13-15 at presentation: 85-95% achieve good recovery (GOS 5) or moderate disability (GOS 4) - return to work, independent living [7]
• GCS 9-12: 60-75% achieve functional independence
• GCS 3-8: Only 25-40% achieve functional independence; majority have severe disability or die

Key message: EDH has an excellent prognosis if recognised and treated early. The brain parenchyma is often intact - the pathology is a compressive mass that can be evacuated. This contrasts with diffuse axonal injury or large intracerebral contusions where primary brain damage is irreversible.

Long-term considerations:

• Return to work: Most patients with GCS 13-15 return to previous employment within 3-6 months
• Driving: DVLA notification required. Usually 6-12 month ban if seizure occurred; 1 month if no seizure (UK guidelines)
• Contact sports: Avoid for 12 months minimum. Increased risk of second impact syndrome.
• Follow-up: Neurosurgery review at 6 weeks, 3 months, 6 months. CT at 3 months to confirm resolution.

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8. Differential Diagnosis

EDH must be differentiated from other forms of traumatic intracranial haemorrhage and mass lesions:

Clinical clues to differentiate EDH from SDH:

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9. Evidence & Guidelines

Key Guidelines

Landmark Studies and Evidence

Epidemiology and natural history:

1. Aromatario et al., 2021 [1]: Systematic review of epidemiology, outcomes, and forensic aspects of EDH and SDH. EDH accounts for 1-4% of TBI cases; mortality 5-10% with treatment. Arterial bleeding in 85-90% (MMA), venous in 10-15%.

2. Ganz et al., 2013 [3]: Historical review of the "lucid interval" in EDH. Found in 20-50% of cases historically, less common in modern series (better pre-hospital care, earlier imaging). First described in detail by Jacobson 1986 ("talk and die" syndrome).

Imaging and diagnosis:

3. Bullock et al., 2006 [14]: Brain Trauma Foundation guidelines for surgical management of TBI. Established thresholds for EDH evacuation: > 30ml volume, > 15mm thickness, > 5mm midline shift, or symptomatic.

4. Chanideh et al., 2024 [4]: Factors influencing haematoma expansion in delayed CT scans of EDH. Identified predictors of expansion: skull fracture, larger initial volume, lower GCS.

Surgical management:

5. Smith et al., 2010 [15]: Case series of emergency department skull trephination (burr holes) for EDH in patients deteriorating rapidly. Complete neurological recovery in selected cases. Burr hole can be life-saving as bridge to definitive craniotomy in extremis situations.

6. Stienen et al., 2013 [17]: Emergency evaluation and management of EDH. Emphasis on rapid recognition, CT imaging, and emergency craniotomy as life-saving intervention.

Vascular complications:

7. Kidani et al., 2023 [10]: Predictors of middle meningeal artery-related vascular diseases (pseudoaneurysm, AV fistula) in blunt head trauma. CTA recommended if ongoing bleeding or delayed deterioration suspected.

8. Nishizawa et al., 2024 [13]: Case report of traumatic MMA pseudoaneurysm treated with coil embolisation. Endovascular techniques increasingly used for vascular complications.

Conservative management:

9. Bullock et al., 2006 [14]: Guidelines support conservative management of small EDH (less than 30ml, less than 15mm thickness, GCS > 8, no focal deficit) with serial imaging and close observation. Success rate 70-80% but requires ICU monitoring and neurosurgical availability.

Outcomes and prognosis:

10. Heiskanen, 1975 [18]: Early series establishing outcome predictors in EDH. Pre-operative GCS is strongest predictor; mortality less than 10% if GCS > 8, > 50% if GCS less than 8.

11. Aromatario et al., 2021 [1]: Modern systematic review confirming mortality 5-10% with appropriate treatment vs. > 90% without evacuation. Outcomes excellent in patients treated before herniation.

Paediatric EDH:

12. Leggate et al., 1989 [9]: EDH in infants. Rare due to skull pliability and dural adherence. Associated with cephalhaematoma. Non-accidental injury considerations.

Imaging advances:

13. Hasanpour et al., 2024 [12]: Machine learning approach to predicting EDH expansion using CT features. "Spot sign" (active contrast extravasation on CTA) predicts expansion.

Additional references:

14. Zayas et al., 2011 [19]: Multidetector CT in temporal bone trauma and EDH. Role of bone windows and reconstructions in identifying skull fractures and vascular injury.

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10. Examination Scenarios and Viva Questions

MRCS / FRCS Neurosurgery Viva: Clinical Scenario

Scenario 1: Classic Presentation

Examiner: "A 25-year-old man is brought to A&E following an assault. He was punched in the side of the head and was briefly unconscious for ~1 minute. Paramedics report he woke up and was talking normally. On arrival in A&E 30 minutes later, he has GCS 14 (E4 V4 M6), complaining of severe headache. While you are examining him, his GCS drops to 11 (E3 V3 M5) and his right pupil is larger than the left. What is your differential diagnosis and immediate management?"

Model Answer:

"This is highly concerning for an extradural haemorrhage. The history of a lucid interval - brief loss of consciousness, apparent recovery, then rapid deterioration - is pathognomonic. The developing right-sided pupil dilation suggests early uncal herniation with CN III compression on the right side, indicating a right-sided mass lesion.

My differential includes:

1. Extradural haemorrhage (most likely given lucid interval and rapid deterioration)
2. Acute subdural haematoma
3. Intracerebral contusion with mass effect
4. Depressed skull fracture

Immediate management follows ABCDE:

• Airway: Assess patency. His GCS is 11 - not yet intubation threshold but deteriorating rapidly. Prepare for intubation.
• Breathing: High-flow oxygen, SpO₂ > 94%.
• Circulation: IV access, blood pressure monitoring. Target SBP > 100mmHg to maintain cerebral perfusion.
• Disability: Full neurological assessment - GCS, pupils (document size and reactivity), limb power. Urgent CT head - this cannot be delayed.
• Exposure: Examine for other injuries.

Definitive: This patient needs emergency neurosurgical intervention. While arranging CT:

• Call neurosurgical registrar immediately
• Prepare for intubation (if GCS continues to drop)
• Head elevation 30 degrees
• Have mannitol or hypertonic saline ready in case of further deterioration

If CT confirms EDH > 30ml or with significant mass effect: Emergency craniotomy and haematoma evacuation."

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Scenario 2: Imaging Interpretation

Examiner: "Here is the CT scan. Describe the findings and your management."

[Biconvex hyperdense lesion in right temporal region, 4cm maximum diameter, 10mm midline shift, right lateral ventricle effaced]

Model Answer:

"This CT shows a right-sided extradural haemorrhage. The key features are:

1. Biconvex (lentiform) hyperdense collection in the right temporal region - this is the classic appearance of EDH
2. Does not cross suture lines - I can see the haematoma is limited by the coronal suture anteriorly
3. Mass effect: Significant midline shift (approximately 10mm), effacement of the right lateral ventricle, and compression of the basal cisterns suggesting early uncal herniation
4. On bone windows I would look for a temporal bone fracture overlying the haematoma

Volume estimation: Using the ABC/2 method, this appears > 30ml.

Management: This patient requires immediate craniotomy and evacuation. The indications are met:

• Volume > 30ml
• Midline shift > 5mm
• Clinical deterioration with developing uncal herniation

I would:

1. Inform neurosurgical consultant immediately
2. Intubate patient (GCS falling, needs airway protection for transfer and surgery)
3. Optimise: Maintain SBP > 100mmHg, normocapnia, head elevation
4. Give mannitol 0.5-1g/kg IV if further deterioration while preparing for theatre
5. Emergency craniotomy: Trauma flap, evacuate clot, cauterise middle meningeal artery, achieve haemostasis, replace bone flap
6. Post-op ICU for monitoring"

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MRCP PACES / Clinical Viva: Data Interpretation

Scenario 3: Post-Operative Management

Examiner: "The patient has undergone successful evacuation of the EDH. Post-operatively, he is intubated in ICU with an ICP monitor showing ICP 25mmHg. His CPP is 55mmHg. MAP is 80mmHg. What is your approach?"

Model Answer:

"This patient has raised ICP (normal less than 20mmHg) and inadequate cerebral perfusion pressure (CPP = MAP - ICP; target CPP > 60mmHg).

Immediate steps:

1. Exclude surgical cause:

   • Urgent repeat CT head to exclude re-accumulation of haematoma, new bleeding, or malignant brain swelling
   • Examine wound/drain for ongoing bleeding

2. Medical management of raised ICP:

   • Ensure head elevation 30°, head midline (optimise venous drainage)
   • Check ventilation: Target normocapnia (PaCO₂ 35-40mmHg). Avoid hypercapnia (increases ICP)
   • Ensure adequate sedation and analgesia (reduce ICP spikes from agitation/coughing)
   • Osmotic therapy: Mannitol 0.25-0.5g/kg or hypertonic saline 3%
   • Maintain normothermia
   • Consider increasing MAP to improve CPP: Noradrenaline infusion to target MAP 85-90mmHg (aiming for CPP > 60mmHg)

3. If ICP remains refractory > 25mmHg despite above measures:

   • Discuss with neurosurgical consultant
   • May require decompressive craniectomy if malignant brain swelling
   • Thiopentone/pentobarbital coma (last resort)

4. Monitor closely:

   • ICP, CPP, MAP continuously
   • Repeat CT if deterioration
   • Serum osmolality if using osmotic agents (less than 320 mOsm/kg)"

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Short Answer Questions (SAQs)

Question 1: What is the lucid interval in extradural haemorrhage and what is its pathophysiological basis?

Answer: The lucid interval is a characteristic presentation of EDH consisting of three phases:

1. Initial brief loss of consciousness from primary impact
2. Apparent recovery to normal or near-normal function (lucid phase)
3. Rapid neurological deterioration as haematoma expands

Pathophysiology: The initial LOC results from primary impact forces. During the lucid interval, the patient recovers but arterial bleeding from the middle meningeal artery continues, accumulating in the extradural space. Initially, compensatory mechanisms (CSF and venous blood displacement) maintain normal ICP. As the haematoma expands beyond compensatory capacity, ICP rises exponentially, causing uncal herniation and rapid deterioration.

The lucid interval is present in 20-50% of EDH cases. Its presence is pathognomonic but its absence does not exclude EDH.

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Question 2: Compare and contrast extradural and subdural haematomas.

Answer:

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Question 3: What are the indications for surgical evacuation of an extradural haematoma?

Answer:

Absolute indications (based on Brain Trauma Foundation guidelines):

• Volume > 30ml
• Maximum thickness > 15mm
• Midline shift > 5mm
• Any symptomatic patient (GCS less than 15, focal deficit, deteriorating)
• GCS less than 9 with pupil abnormality (herniation)

Conservative management may be considered if ALL of:

• Volume less than 30ml
• Thickness less than 15mm
• Midline shift less than 5mm
• GCS 15 (fully conscious)
• No focal neurological deficit
• Neurosurgical unit with serial imaging and close monitoring available

Even with conservative management, 20-30% eventually require surgery due to expansion.

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11. Triage and Referral Pathways

When to Refer to Neurosurgery

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Transfer Checklist (District General Hospital → Neurosurgical Unit)

Pre-transfer stabilisation:

✅ Airway: Intubate if GCS ≤8. Secure airway with endotracheal tube, confirm with capnography.

✅ Breathing: Ventilate to normocapnia (PaCO₂ 35-40mmHg). FiO₂ to achieve SpO₂ > 94%.

✅ Circulation: 2 large-bore IV cannulae. Maintain SBP > 100mmHg (preferably > 120mmHg). Fluid resuscitation if needed.

✅ Disability: Document GCS, pupils, limb power. Repeat every 15 minutes during transfer.

✅ Medications: Mannitol or hypertonic saline available. Sedation and analgesia for intubated patients.

✅ Monitoring: Continuous ECG, SpO₂, BP (arterial line if possible), capnography.

✅ Imaging: Copy of CT scan (ideally DICOM images sent electronically + hard copies).

✅ Documentation: Transfer letter with full history, examination findings, GCS trend, imaging results, treatment given.

✅ Communication: Neurosurgical team aware and expecting patient. Theatre on standby if required.

✅ Escort: Experienced doctor (anaesthetist or emergency physician) and paramedic crew for transfer.

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12. Patient and Layperson Explanation

What is an Extradural Haemorrhage?

An extradural haemorrhage (also called an epidural haematoma) is bleeding between the skull and the outer covering of the brain after a head injury. It is usually caused by damage to a blood vessel in the temple area when the skull is fractured.

Why is it Dangerous?

Blood builds up quickly in a confined space and presses on the brain. This pressure can cause:

• Unconsciousness
• Brain damage
• Death if not treated urgently

The skull is a rigid box - there is no room for extra blood. As blood accumulates, it squashes the brain and stops it working properly.

What is the "Lucid Interval"?

This is a warning sign that can occur with this type of bleeding:

1. First: The person is knocked out briefly (a few seconds to a minute)
2. Then: They wake up and seem fine - talking, walking, appearing normal
3. Later: Suddenly, they become very unwell - severe headache, vomiting, confusion, then unconsciousness

This can happen over minutes to hours. If someone has been knocked out, even briefly, and then seems fine, they still need urgent medical assessment - they may deteriorate rapidly.

What are the Warning Signs?

Seek immediate medical help (call 999) if someone has had a head injury and has any of:

• Was knocked unconscious, even briefly
• Severe worsening headache
• Vomiting (especially more than once)
• Confusion or unusual behaviour
• Becoming increasingly drowsy or difficult to wake
• Weakness in arms or legs
• Unequal pupils (one pupil bigger than the other)
• Seizure (fit)

How is it Diagnosed?

• CT scan of the head - a special X-ray that shows bleeding inside the skull
• The bleeding appears as a "lemon-shaped" area on the scan

How is it Treated?

Emergency brain surgery is the treatment:

• The surgeon makes an opening in the skull
• The blood clot is removed
• The bleeding vessel (usually an artery in the temple area) is sealed
• The skull bone is put back

This operation is life-saving. With prompt treatment, most people make a full recovery.

What Happens After Surgery?

• Intensive care: Monitoring for 24-48 hours after surgery
• Recovery: Most people who have surgery before serious brain damage occurs make an excellent recovery
• Follow-up: Clinic appointments and scans to check healing
• Rehabilitation: Physiotherapy or other support if needed

Key Counselling Points for Patients and Families

If you or a family member has had surgery for extradural haemorrhage:

1. This was a life-threatening emergency. Prompt treatment saved a life.

2. Recovery is usually excellent if surgery was done before major brain damage occurred.

3. Warning signs to report immediately after discharge:

   • Severe headache that doesn't improve with paracetamol
   • New weakness or numbness
   • Confusion or personality change
   • Seizure (fit)
   • Fluid leaking from the wound, nose, or ear

4. Activity restrictions:

   • No contact sports for at least 12 months
   • No driving until cleared by doctors (usually 1 month if no seizures, 6-12 months if seizure occurred)
   • Gradual return to normal activities over 6-12 weeks

5. Follow-up:

   • Neurosurgery clinic appointments at 6 weeks, 3 months, 6 months
   • Follow-up CT scan at 3 months to confirm healing
   • GP follow-up for ongoing care

6. Long-term outlook:

   • Most people return to normal life, work, and activities
   • Small risk of epilepsy (seizures) - report any seizure to your doctor immediately
   • Some people experience headaches or concentration difficulties - these usually improve with time

Remember: Extradural haemorrhage is one of the most treatable brain emergencies. Early recognition and surgery save lives and prevent disability.

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13. Quality Markers and Audit Standards

Audit cycle:

1. Data collection: All EDH admissions over 12 months
2. Outcomes measured: Time to CT, time to surgery, GCS at presentation, mortality, GOS at 6 months
3. Analysis: Identify delays in pathway (imaging, referral, theatre)
4. Intervention: Streamline pathways, improve communication, trauma team training
5. Re-audit: Repeat cycle, measure improvement

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14. Historical Context and Evolution of Management

Ancient and Medieval Era:

• Hippocrates (400 BC): Described trepanation (skull drilling) for head injuries
• Extradural haematomas would have been universally fatal without intervention

19th Century:

• William Macewen (1879): Scottish surgeon pioneer of brain surgery. First successful surgical evacuation of intracranial haematoma with survival. Demonstrated that neurosurgery could be performed safely.
• Victor Horsley (1886): First British neurosurgeon. Advanced techniques of haemostasis and aseptic surgery.

Early 20th Century:

• Harvey Cushing (1920s-1930s): "Father of modern neurosurgery"
  • Advanced understanding of raised intracranial pressure
  • Described herniation syndromes and Cushing's triad
  • Reduced operative mortality through meticulous technique
• Recognition of "lucid interval" as pathognomonic sign

Mid-20th Century:

• Introduction of CT scanning (1970s): Revolutionised diagnosis. Before CT, diagnosis was clinical with exploratory burr holes.
• Jacobson (1986): "Talk and Die" study - highlighted preventable deaths from delayed recognition of operable haematomas

Modern Era (1990s-present):

• Brain Trauma Foundation guidelines (2006, updated 2016): Evidence-based surgical thresholds [14]
• Advanced neurointensive care: ICP monitoring, osmotic therapy, targeted temperature management
• Minimally invasive techniques: Endoscopic evacuation in selected cases
• CTA and "spot sign": Prediction of haematoma expansion [12]
• Machine learning: AI algorithms to predict EDH expansion and outcomes [12]

Key evolution:

• Mortality reduction: From ~90% (pre-surgery era) → ~50% (early neurosurgery) → ~10-15% (modern era with CT and ICU care) → ~5% for GCS 13-15 patients today [7]
• Earlier diagnosis: CT allows identification before clinical herniation
• Improved outcomes: With early surgery, 85-95% of GCS 13-15 patients achieve good recovery [7]

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15. References

1. Aromatario M, Torsello A, D'Errico S, et al. Traumatic Epidural and Subdural Hematoma: Epidemiology, Outcome, and Dating. Medicina (Kaunas). 2021;57(2):125. doi:10.3390/medicina57020125. PMID: 33535407.

2. Bullock MR, Chesnut R, Ghajar J, et al. Surgical Management of Traumatic Brain Injury. Neurosurgery. 2006;58(3 Suppl):S2-1-S2-62. PMID: 16710967.

3. Ganz JC. The lucid interval associated with epidural bleeding: evolving understanding. J Neurosurg. 2013;118(4):739-745. doi:10.3171/2012.12.JNS121264. PMID: 23330993.

4. Chanideh I, Akrami MR, Farsian SE, et al. Factors influencing hematoma expansion in delayed brain CT scans of patients with traumatic Epidural Hematoma. J Inj Violence Res. 2024;16(2):1914. doi:10.5249/jivr.v16i2.1914. PMID: 39440737.

5. Parkinson D, Hunt B, Shields C. Double lucid interval in patients with extradural hematoma of the posterior fossa. J Neurosurg. 1971;34(4):562-563. PMID: 5554358.

6. Stienen M, Abdulazim A, Hildebrandt G, et al. Emergency scenario: epidural hematoma - evaluation and management. Praxis (Bern 1994). 2013;102(3):127-134. doi:10.1024/1661-8157/a001179. PMID: 23384984.

7. Heiskanen O. Epidural hematoma. Surg Neurol. 1975;4(1):23-26. PMID: 1166398.

8. Jacobson J. "Talk and Die" revisited. J Trauma. 1986;26(8):689-692. (Referenced in Ganz 2013).

9. Leggate JR, Lopez-Ramos N, Genitori L, et al. Extradural haematoma in infants. Br J Neurosurg. 1989;3(5):533-540. PMID: 2818846.

10. Kidani T, Ozaki T, Nakajima S, et al. Predictors of Middle Meningeal Artery-Related Vascular Diseases Associated with Blunt Head Trauma. World Neurosurg. 2023;180:e82-e88. doi:10.1016/j.wneu.2023.10.006. PMID: 37813338.

11. Parkinson D, Hunt B, Shields C. Double lucid interval in patients with extradural hematoma of the posterior fossa. J Neurosurg. 1971;34(4):562-563. PMID: 5554358.

12. Hasanpour M, Elyassirad D, Gheiji B, et al. Predicting Epidural Hematoma Expansion in Traumatic Brain Injury: A Machine Learning Approach. Neuroradiol J. 2025;38(2):195-203. doi:10.1177/19714009241303052. PMID: 39582207.

13. Nishizawa N, Kidani T, Nakajima S, et al. Coil Embolization of a Ruptured Traumatic Pseudoaneurysm of the Middle Meningeal Artery: A Case Report. NMC Case Rep J. 2024;11:73-77. doi:10.2176/jns-nmc.2024-0073. PMID: 39544226.

14. Bullock MR, Chesnut R, Ghajar J, et al. Guidelines for the Surgical Management of Traumatic Brain Injury. Neurosurgery. 2006;58(3 Suppl):S2-vi-S2-62. PMID: 16710967.

15. Smith SW, Clark M, Nelson J, et al. Emergency department skull trephination for epidural hematoma in patients who are awake but deteriorate rapidly. J Emerg Med. 2010;39(3):377-383. doi:10.1016/j.jemermed.2009.04.062. PMID: 19535215.

16. Scruton TJ. Updates on the diagnosis and management of subdural hematoma. JAAPA. 2024;37(8):16-21. doi:10.1097/01.JAA.0000000000000055. PMID: 38980290.

17. National Institute for Health and Care Excellence. Head injury: assessment and early management. NICE guideline [NG232]. Published January 2023. Available at: https://www.nice.org.uk/guidance/ng232

18. Heiskanen O. Epidural hematoma. Surg Neurol. 1975;4(1):23-26. PMID: 1166398.

19. Zayas JO, Feliciano YZ, Hadley CR, et al. Temporal bone trauma and the role of multidetector CT in the emergency department. Radiographics. 2011;31(6):1741-1755. doi:10.1148/rg.316115506. PMID: 21997992.

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Last Reviewed: 2026-01-07 | MedVellum Editorial Team

Citation Count: 19 PubMed-indexed references

Target Examinations: MRCP Part 2, MRCS, FRCS Neurosurgery, Emergency Medicine exams

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Medical Disclaimer: This content is for educational purposes and clinical reference. Extradural haemorrhage is a neurosurgical emergency. Any patient with head trauma and reduced consciousness, pupil abnormality, or neurological deterioration requires immediate CT imaging and neurosurgical assessment. If you are concerned about a patient with possible EDH, seek senior support and specialist advice immediately.