Intraventricular hemangiopericytoma.

Hemangiopericytoma is a rare tumor of the central nervous system and has seldom been reported intraventricularly. A 55-year-old woman presented with gradual onset of left side weakness, gait ataxia, and tendency to miss objects in the left visual field of uncertain duration. Magnetic resonance imaging with contrast showed a tumor with homogenous enhancement in the right lateral ventricle. The patient underwent right temporoparietal stealth-assisted craniotomy and surgical removal of the tumor. Histopathologic examination with ancillary tests confirmed hemangiopericytoma. Awareness that hemangiopericytoma can occur as an intraventricular tumor is important for clinicians and pathologists. Because of radiologic similarity, this tumor is not to be confused with intraventricular meningioma because the prognosis is different.