History of brainstem epidermoid and pituitary adenoma for surveillance. Redemonstrated is a lobulated nonenhancing T2 hyperintense mass centered in the right cerebellomedullary angle cistern that extends into the right foramen of Luschka and encases the right vertebral and posterior inferior cerebellar arteries. The mass is unchanged in size and measures approximately 25 x 25 x 25 mm (AP x TR x CC). There is persistent mass effect on the right middle cerebellar peduncle and brainstem. There is no definite associated diffusion restriction.There is an unchanged pituitary mass that measures up to 16 mm in craniocaudal dimension, which abuts the undersurface of the optic chiasm, left greater than right side. This has progressed in the CC dimension since the more remote exam from 2008.There is no evidence of intracranial hemorrhage or acute infarct. The ventricles are unchanged in size and configuration. There is no midline shift or herniation. The skull and extracranial soft tissues are unremarkable.
1. Stable appearance of mass centered within the right cerebellomedullary angle cistern, which likely represents an epidermoid.2. Stable appearance of pituitary mass, which likely represents a macroadenoma. 