Parkinson's disease; planning for DBS. There is apparent absence of the "swallow tail sign" in the bilateral substantia nigrosomes. There is no evidence of intracranial mass. 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.
Findings compatible with Parkinson's disease. Otherwise, unremarkable MRI for preoperative planning. 