Fig. 1

Pre-operative images of computed tomography (CT) scans and magnetic resonance imaging (MRI). a CT revealed a cystic lesion with a mural nodule in the left hemisphere of the cerebellum. The lower panel shows a magnified image of the area within the red rectangle in the upper panel. The nodular component was accompanied by a high attenuated area, suggesting focal calcification. Hydrocephalus was associated with a shift of the fourth ventricle to the right. b Contrast-enhanced CT showed mild enhancement in the mural nodule. The lower panel shows a magnified image of the area within the red rectangle in the upper panel. c, d MRI demonstrated that the cystic lesion was hypointense on a T1-weighted image (c) and hyperintense on a T2-weighted image (d). The tumor was well-defined, and no peritumoral brain edema was present. e T2 star-weighted image shows a hemorrhage within the cyst and in the mural nodule. f Fluid-attenuated inversion recovery image shows hydrocephalus with periventricular hyperintensity