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¹Sree Chitra Tirunal Institute for Medical Sciences and Technology, Department of Neurosurgery, Trivandrum, Kerala, India
²Sree Chitra Tirunal Institute for Medical Sciences and Technology, Department of Radiology, Trivandrum, Kerala, India
³Sree Chitra Tirunal Institute for Medical Sciences and Technology, Department of Pathology, Trivandrum, Kerala, India DOI : 10.5137/1019-5149.JTN.3644-10.1 Subarachnoid haemorrhage (SAH) associated with intra-axial tumours is extremely uncommon and is usually seen in association with intratumoural bleed. Tumours located near the ventricle or subarachnoid spaces have a higher propensity for SAH compared to intraparenchymal lesions. Low-grade tumours rarely demonstrate any evidence of bleed on imaging. Oligoastrocytomas of the posterior fossa are rare tumours in adults and their presentation with intratumoural haemorrhage and SAH is unknown. We report a unique case of cerebellar low-grade oligoastrocytoma that mimicked a tentorial-based extraaxial lesion on imaging and presented with SAH. Susceptibility-weighted magnetic resonance imaging is a useful imaging modality to demonstrate blood within and outside the tumour. Keywords : Oligoastrocytoma, Subarachnoid haemorrhage, Susceptibility-weighted imaging, Intratumoural bleed