Hemiparkinsonian syndrome due to a cerebral tumor infiltrating the substantia nigra.

Parkinsonism due to a cerebral tumor is rare and usually caused by an indirect effect of supratentorial tumors on nigrostriatal pathways rather than by direct involvement of the substantia nigra. Only three previous cases of midbrain infiltration causing Parkinsonism have been reported. We report the case of a young woman with a left tremo-akineto-rigid parkinsonian syndrome caused by a tumor of the brainstem infiltrating the right substantia nigra.