A 16-year-old female presented with a seven month history of headaches and difficulty with gait. She had no significant past medical history. Neurologic examination revealed mild right cerebellar dysfunction. She underwent a suboccipital craniotomy and resection of a right cerebellar lesion.
Magnetic resonance (MR) images of the brain revealed a lesion within the right cerebellar hemisphere. On T1-weighted MR images, the lesion exhibited a striated pattern of alternating isointense and hypointense zones that did not enhance following the administration of contrast (Fig 1). The lesion was hyperintense on T2-weighted images, and also showed a striated appearance (Fig 2). There was prominent mass effect on the caudal medulla.
DIAGNOSIS AND DISCUSSION