Intraventricular gliosarcoma: unusual location of an uncommon tumor

Gliosarcomas are uncommon variants of glioblastoma bearing the histological hallmark of two distinct tumor components (high grade glial and sarcomatous). They share similarities with glioblastomas as far as clinico-epidemiological and prognostic factors are concerned. They are commonly cortically-surfacing lesions occurring mostly in the supratentorial compartment. Intraventricular location of a gliosarcoma is very uncommon and reported only once before. We report one such case where the lesion was subependymal and protruded into the ventricle giving the appearance of a truly intraventricluar tumor. We discuss this case and review the relevant literature.