Metastatic medullary thyroid cancer with questionable CT findings. There is a homogeneously enhancing dural-based mass along the lateral aspect of the left posterior fossa, which measures up to 20 mm. There is mild mass effect upon the left cerebellar hemisphere, but no evidence of associated edema. There is no evidence of intracranial hemorrhage or acute infarct. There is a subcentimeter focus of encephalomalacia in the left caudate. There is no abnormal intraparenchymal enhancement. The ventricles and basal cisterns are normal in size and configuration. There is no midline shift or herniation. The major cerebral flow voids are intact. The orbits, skull, paranasal sinuses, and scalp soft tissues are grossly unremarkable.
1. A dural-based mass along the lateral aspect of the left posterior fossa that measures up to 20 mm likely represents a meningioma versus less likely a dural metastasis.2. No evidence of intraparenchymal brain metastases. 2. Chronic left caudate lacunar infarct.