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A cystic teratoma in skin.

This is a report of a child who had a subcutaneous cyst that was filled with cornified cells and hair and lined by respiratory epithelium with seromucous glands and partly by squamous epithelium like that of the follicular infundibulum to which epithelial structures of adnexa were attached. The cyst wall was encircled incompletely by fascicles of mature smooth muscle. Differential diagnosis is discussed and cystic teratoma in skin is suggested as a proper term for the condition.