Partial tentorial hypoplasia with ipsilateral focal brain herniation is an extremely rare cause of idiopathic intracranial herniation with very few
cases reported in the literature. This is an essentially benign condition which may mimic a sinister pathology to a radiologist unaware of this rare
entity.We present a case of 58 year old male presenting with giddiness and headaches. An MRI brain was performed which revealed this rare
incidental nding which on the rst look simulated a mass.
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