Psych CASC / OSCE · Consultation-liaison psychiatry
Explaining suspected autoimmune encephalitis to parents — CASC communication station
MRCPsych/FRANZCP-style station: explain organic autoimmune possibility in plain language, justify investigations and immunotherapy principles, correct antipsychotic misunderstanding without defensiveness, and plan shared decisions.
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Target exams
Station brief
Format. Communication station, approximately 7–10 minutes after reading time. You are the psychiatry registrar. Neurology is involved; you meet both parents. [1]
Candidate instructions. Explain why the team suspects a possible autoimmune brain inflammation that can look like psychosis, why lumbar puncture and further tests are needed, what immunotherapy means in plain language, why pelvic imaging may be required, and the limited role of antipsychotics. Respond to anger without defensiveness. Avoid inventing legal section numbers. Check understanding and agree next steps. [2][3]
Candidate scenario
Parents: “You gave her psychiatric drugs and now she can’t speak. Are you covering up a drug side-effect? We will not allow a spinal needle or cancer scans. Just send her to a private psychologist.” Observations show mutism and orofacial movements; MRI was normal; LP and antibody testing are planned. [4]
Marking domains
- Empathy, structure, non-defensive stance
- Clear plain-language model of autoimmune encephalitis as treatable brain inflammation that can present as psychosis
- Justification of LP, EEG, antibody testing, and tumour imaging
- Honest description of steroids/IVIG/plasma exchange and possible further immunotherapy
- Balanced message on antipsychotics as supportive only
- Shared plan, understanding check, named follow-up [1][2][3]
Reveal assessor key
Open. Introduce role, acknowledge fear and anger. “I can hear how frightening this looks, and you are right to ask hard questions.” [1]
Explain the illness model. “We are worried this may not be ordinary first-episode psychosis alone. Some people develop an immune condition — autoimmune encephalitis, classically anti-NMDA receptor encephalitis — where antibodies disrupt brain receptors. It can start with psychiatric symptoms, then speech problems and abnormal movements. It is a medical brain condition that psychiatry and neurology manage together.” [4][2]
Why tests. “A normal MRI does not rule this out. A lumbar puncture looks at inflammation and allows the best antibody tests from spinal fluid as well as blood. EEG looks at brain electrical activity. In young women we also carefully check for an ovarian teratoma — a growth that can trigger the immune attack and should be removed if present.” [3][2]
Treatment. “If this is likely autoimmune encephalitis, treatment is immunotherapy — often high-dose steroids, immunoglobulin infusions, and sometimes plasma exchange — not more antipsychotic as the main cure. Some people need further immune medicines. Many improve with early treatment, though recovery can take months.” [2][3]
About antipsychotics. “Psychiatric medicines were used to keep her safe from distress and risk. They are not the cause of classic autoimmune dyskinesias in this pattern, and they are not enough on their own. We will use the lowest necessary symptomatic medicines while treating the immune cause.” [1]
Close. Summarise, invite questions, offer written information, introduce neurology contact, document consent/capacity pathway if she cannot decide. Avoid inventing statute numbers; state least-restrictive legal principles under local law if emergency treatment is required. [1][3]
References
- [1]Pollak TA, Lennox BR, Müller S, et al. Autoimmune psychosis: an international consensus on an approach to the diagnosis and management of psychosis of suspected autoimmune origin Lancet Psychiatry, 2020.PMID 31669058
- [2]Titulaer MJ, McCracken L, Gabilondo I, et al. Treatment and prognostic factors for long-term outcome in patients with anti-NMDA receptor encephalitis: an observational cohort study Lancet Neurol, 2013.PMID 23290630
- [3]Abboud H, Probasco JC, Irani S, et al. Autoimmune encephalitis: proposed best practice recommendations for diagnosis and acute management J Neurol Neurosurg Psychiatry, 2021.PMID 33649022
- [4]Dalmau J, Gleichman AJ, Hughes EG, et al. Anti-NMDA-receptor encephalitis: case series and analysis of the effects of antibodies Lancet Neurol, 2008.PMID 18851928