A rare case of intradiploic epidermoid cyst of the skull

A 32-year-old male was admitted to our hospital because of limb convulsions, foaming at the mouth and disturbance of consciousness for 3 days. He had been suffering from seizures, headache and focal tenderness of the skull since childhood. CT scan showed a hypodense mass measuring 6 cm × 5.5 cm × 3.5 cm in the right parietal bone with nodular high density, without enhancing effect (Fig. 1A), and an osteolytic and expansive expansion of the inner and outer tables of the skull and bony erosion (Fig.