A Case of Large Intradiploic Epidermoid Cyst of the Temporal Bone / 대한이비인후과학회지

ABSTRACT

Intradiploic epidermoid cysts of the skull are benign lesions that are derived from the ectodermal cells of the cranium. They are rare tumors and they represent less than 1% of all intracranial tumors. The frontal and parietal bones are the most common sites for the cysts, but the temporal bone is rarely involved. They are slowly growing tumors, and may often reach an enormous size without producing neurological symptoms. For treatment, it is important to completely remove the capsule of the cysts to avoid recurrence. Malignant transformations of the cysts, which are very rare, are generally found in cases which have repeated recurrences or infections. We present a patient with an intradiploic epidermoid cyst of the temporal bone, which is located behind the left mastoid cavity. We removed the cyst successfully through transmastoid approach.