A congenital inclusion cysts that arises from the inclusion of ectodermally committed cells at the time of neural tube closure (3rd-5th week of embryogenesis). The capsule of dermoid cysts consists of simple epithelium supported by collagen. In thicker parts, the lining is supplemented with dermis containing hair follicles, sebaceous glands, and apocrine glands. [ http://www.ncbi.nlm.nih.gov/pubmed/16714456 ]