Co-occurrence of an intraventricular meningioma and cholesterol granuloma of the choroid plexus in a cat.

A 12-year-old domestic shorthair cat was presented with neurologic signs localized to the forebrain. Magnetic resonance imaging (MRI) of the brain revealed a space occupying lesion within the third and the lateral ventricles. The lesion had areas of disparate signal characteristics and exerted a mass effect on the surrounding parenchyma and ventricular system. The histologic examination identified the co-existence of two intraventricular masses: a meningioma and a choroid plexus cholesterol granuloma.