Presentation
Patient is a known case of left fronto-temporal low grade astrocytoma post de bulking surgery on chemotherapy
Patient Data
An extra-axial SOL is noted in the quadrigeminal cistern in the right para sagittal plane just posterior to the tectal plate of the mid brain, eliciting hyperintense signal on T1 and hypointense signal on T2, shows complete loss of signal on the T1 fat saturation sequence, suggestive of fat-containing lesion. It shows blooming on the GRE sequence and no significant contrast enhancement.
Case Discussion
Intracranial lipomas are rare benign congenital neoplasms accounting for 0.1 to 0.5% of all primary brain tumors. Quadrigeminal cistern lipomas make up approximately 25% of intracranial lipomas and are located within the quadrigeminal cistern. They may be associated with hypoplasia of the inferior colliculus or agenesis of the corpus callosum. These are slow-growing benign lesions, usually asymptomatic and rarely require surgery. Diagnosis of quadrigeminal cistern lipoma is always definitive on MRI study and therefore histopathological confirmation is practically never required.
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