Epidermoid cysts have a thin squamous lining, which only rarely contains calcifications. These cysts contain debris from the desquamation of their squamous epithelial lining. The debris consists of mostly keratin, a proteinaceous material, and some cholesterol, a lipid material derived from the breakdown of cell membranes. On CT, the epidermoid cysts appeared hypodense with no evidence of enhancement after contrast material and edema is absent. 1.5% located in Cerebral hemispheres and 25% are calcified.