H/o renal cell carcinoma with known cerebellar metastasis. Examination demonstrates postoperative change of a left suboccipital craniotomy, including edema and trace amount of blood product at the surgical site. The mass in the left medial cerebellum identified on prior MRI has been resected. The one in the left lateral cerebellum is still present and appears hemorrhagic. It measures 1 x 1 cm. The cerebral hemispheres appear normal in attenuation and morphology. Supratentorially, there is no intracranial hemorrhage, or midline shift. The ventricles appear enlarged. A left frontal arachnoid cyst with remodeling of the adjacent frontal bone is noted. The visualized paranasal sinuses and mastoid air cells are normally pneumatized.
1. Postoperative change of a left suboccipital craniotomy. 2. Left cerebellar hemorrhagic metastatic lesion. 3. Hydrocephalus. 4. Left frontal arachnoid cyst. 