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Gelastic seizure from hypothalamic hamartoma — SCE Neurology MCQ

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HardEpilepsyGelastic seizure from hypothalamic hamartomaSCE Neurology

A 31-year-old woman presented with brief inappropriate laughter from childhood followed by behavioural arrest. On examination, puberty occurred early and neurological examination was otherwise normal. Initial investigations showed: MRI showed a non-enhancing hypothalamic lesion attached to the tuber cinereum. What is the most likely diagnosis?

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Correct answer: D — Gelastic seizure from hypothalamic hamartoma

Gelastic seizure from hypothalamic hamartoma is the best answer because the vignette describes Gelastic seizure from hypothalamic hamartoma: gelastic seizures with precocious puberty indicate hypothalamic hamartoma. Juvenile myoclonic epilepsy is plausible in a neighbouring presentation, but the chronology, examination or investigation pattern does not match the key discriminator here. Photosensitive epilepsy and Non-convulsive status epilepticus are less appropriate because they would require different localisation, timing or test findings; First unprovoked seizure would fit a different syndrome. Clinical pearl: frontal lobe epilepsy may cause laughter but would not explain the hypothalamic lesion.

Reference: NICE NG217; BNF; DVLA Assessing fitness to drive