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Dermoid Cyst
Cutaneous dermoid cysts typically present in an infant along an embryonic fusion plane as a discrete, subcutaneous nodule (see Ch.ย 64). Dermoid cysts are usually 1โ4โcm in diameter. The most common location is around the eyes.
Pathology
Histologically, dermoid cysts are lined by stratified squamous epithelium that includes a granular layer. They contain other normal cutaneous structures such as hair, sebaceous lobules, eccrine glands, apocrine glands, and/or smooth muscle.
Treatment
Treatment is by excision. However, as the differential diagnosis includes neural heterotopias, imaging studies may be appropriate prior to excision in order to exclude a connection to the CNS (see Ch. 64).