Superior cerebellar aneurysm causing subarachnoid haemorrhage in a 17-year-old with alagille syndrome.

Alagille syndrome is a rare autosomal dominant condition characterised by mutation in Jagged1 gene. Intracranial aneurysms may be seen in this condition and may present as subarachnoid hemorrhage. We describe the first case of superior cerebellar aneurysm rupture causing WFNS grade 1 subarachnoid haemorrhage in a 17-year-old girl. The clinical condition and management of this rare occurrence is discussed with a review of literature.