Hemangioblastoma involving the cerebellum. The patient was a 38 y/o male who presented with severe headaches and loss of vision in the left eye. MRI scan (T2 image) shows a hyperintense nodule with cystic areas in the cerebellum. Most patient present with symptomas related to the obstruction of cerebrospinal fluid. About 10% of patients have secondary polycythemia vera due to erythropoietin production. Case produced with permission, courtesy of Dr. Frank Gaillard. Radiopaedia. Complete case is here.