EPIDERMOID AND DERMOID SEQUESTRATION CYSTS

Abstract

Epidermoid and dermoid sequestration cysts are a form of heterotopia due to displaced or implanted ectoderm. They are unrelated to benign cystic teratomas. Congenital cysts occur following inclusion of epidermis at time of embryonic closure of the neural groove or of epithelial fusion lines in the head and neck and about the anus. If only epidermis is included, the cyst is an epidermoid. A dermoid cyst is formed if dermal elements are also present. If either communicates with the skin, a dermal sinus is created.