Plunging congenital epidermoid cyst of the oral cavity.

Epidermoid cysts are rare lesions in the oral cavity. They usually present early in life and are confined to one anatomical area. Simple excision is all that is needed. However, they may present late in life and be large in size, making their excision a real challenge. We present a case of congenital epidermoid cyst of the sublingual space that presented late, at the age of 17 years, after it plunged into the submental area. The presentation of the patient and the surgical approach are discussed.