A voluminous extra-axial lesion located in the left lateral sector of the posterior fossa with a rounded aspect and dural base is identified, which after gadolinium administration presents intense enhancement. It generates mass effect on the local cerebellum identifying parenchymal edema, partial obliteration of the fourth ventricle and occupation of the foramen magnum at the expense of tonsillar descent. Partial invasion into the homolateral transverse/sigmoid sinus was observed without generating thrombosis.