Explain the workup and the treatable-cause principle to the parents of a regressing adolescent — OSCE

Candidate brief

You are the paediatric registrar managing this adolescent on the ward. The task is to explain, in plain language, that the daughter's rapid change is a neurological problem called autoimmune encephalitis - a condition in which the immune system mistakenly attacks the brain - and that it is treatable when treatment is started early. You must convey honestly that a mental health presentation is one possibility but that the pattern of psychiatric change, seizures, and a movement disorder points to an inflammation of the brain that needs urgent investigation and treatment now, outline the workup and why a lumbar puncture and a scan are needed, and address the parents' fear and the relative's comment without dismissing them. Agree a clear next-step plan with a named contact and a follow-up. The consultation is ten minutes. [1] [2]

Key teaching points for the candidate

The hinge of the consultation is the phrase "an inflammation of the brain that we can treat." The candidate should explain in family-accessible terms that the immune system, which normally fights infection, has mistakenly turned against a part of the brain - producing the agitation, the hallucinations, the seizure, and the repetitive movements - and that this is why a neurologist has been called rather than a psychiatrist alone. The candidate should name the principle that governs the urgency: treatment works best when it is started early, before the inflammation causes lasting injury, which is why treatment is being started now while the confirmatory blood and spinal-fluid tests are still being processed. [2] [3]

The candidate should explain the workup in terms the family can act on: blood tests and a spinal-fluid test that look for the specific antibody causing the inflammation, a brain scan that shows whether a part of the brain or a tumour is involved, and an electrical test of the brain. The candidate should be honest that some results return within hours and others take weeks, and that the team will not wait for all of them before treating - because the framework that specialists use allows them to diagnose and treat this condition on the clinical picture before the final test confirms it. [3]

Communication tasks

The candidate should break the news in plain language and pace the information to the parents' readiness, acknowledging their fear and the relative's comment about a mental health crisis without either agreeing prematurely or dismissing it. The candidate should explain what autoimmune encephalitis is and why urgent treatment is justified, describe the workup in terms the family can act on, and give an honest account of the timeline - that some results return within hours and others take weeks, and that the team will keep the family informed at every step. The candidate should offer a written summary, a named coordinator or contact, and a plan for ongoing communication, and should check understanding before closing - asking the parents to say back what will happen next, so that the plan is genuinely shared. [2] [3]

The candidate should also address the emotional dimension: the suddenness of the change, the fear of a degenerative or permanent condition, and the parents' need for hope that is grounded in real information rather than false reassurance. The honest frame is that the condition is serious but treatable, that early treatment offers the best chance of recovery, and that the team will revisit the outlook together as the response to treatment becomes clear. [1]