Oral manifestations of systemic disease — structured clinical encounter

Candidate brief

You are the paediatric registrar in the emergency department. A six-year-old boy has two weeks of fatigue, easy bruising and progressively swollen, painful, bleeding gums. On examination he is pale, the gums are diffusely boggy, enlarged and bleed on touching, there are petechiae on the palate and bruising on the shins, and his temperature is 38.6 degrees Celsius. [1]

Task

Take the focused history, present your differential, justify the urgent full blood count and film and the neutropenic-sepsis safety, and explain why the gum infiltration resolves only with treatment of the leukaemia. Be prepared to defend the distinction between leukaemic infiltration and simple gingivitis. A second child — a nine-year-old with chalky symmetrical dental enamel defects and faltering growth — will then be introduced for contrast. [1]

Discussion anchors

• Diagnosis and safety: acute leukaemia from the pale, tired child with boggy enlarged bleeding gums out of proportion to plaque, palatal petechiae and bruising indicating thrombocytopenia; the gum is infiltrated, not simply inflamed, and bleeding and sepsis are the immediate risks. [1]
• Urgent work-up: secure intravenous access, send an urgent full blood count and film to confirm leukaemia and the cytopenias, give empiric broad-spectrum antibiotics for presumed neutropenic sepsis given the fever, and transfer urgently to paediatric haematology. [1]
• Why the mouthwash fails: the gingival infiltration is leukaemic deposit and resolves only with chemotherapy, not with oral hygiene or topical therapy; the mouth is the alarm, not the emergency, but it must not be ignored. [1]
• Contrast case — coeliac disease: the nine-year-old with chalky symmetrical dental enamel defects on the permanent incisors and first molars, recurrent aphthae, angular cheilitis and faltering growth has the oral signature of coeliac disease; send coeliac serology (tissue transglutaminase IgA) with a total IgA to exclude IgA deficiency, confirm with biopsy if positive, and start a gluten-free diet with paediatric dental referral, explaining that existing defects are permanent but the diet prevents new ones and heals the gut. [2] [3]
• Disposition and safety-net: discharge the controlled child with a structured oral-care plan, fluoride and regular dental review, and refer every persistent, atypical or non-healing lesion beyond two to three weeks to paediatric dentistry and the relevant medical subspecialty. [2]