PMC3222084_01
A, CT scan revealed a hyperdense lesion containing irregular isodense area in the posterior fossa; The lesion presented hyper-intensity on T1WI (B), hypo-intensity on T2WI (C). D, macroscopic view of the removed lesion; E, interstitial hemorrhage within dermoid cyst; F, squamous epithelium, calcification, keratinous materials and cholesterol deposits. (Eematoxylin-Eosin staining, E, 20x; F, 40x.)
ijmsv09p0011g01.jpg
PMC3222084_01_ijmsv09p0011g01.jpg
F1
CT scanning revealed that a lobar hyperdense lesion with an internal irregular isodense area was located in the posterior fossa (Figure 1). On MR imaging, the lesion was hyper-intensive on T1WI and hypo-intensive on T2WI, located within the cerebellar vermis and measured 3.5cmx3.9cmx3.0cm (Figure 1). Its content consisted mainly of chocolate-like material, hair and old hematoma (Figure 1). The findings of histological examination included squamous epithelium, calcification, keratinous material, hairy substance, hemorrhage, and sheets or nests of hemosiderin-containing histiocytes, which were consistent with the histological features of dermoid cysts (Figure 1).