Linear nevus sebaceous syndrome.

The pathologic terms hamartoma, choristoma, nevus, and phakoma often are confused. We discuss them in relation to a patient with the linear nevus sebaceous syndrome who had a large limbal mass that grew unusually rapidly and was excised. Histopathologic examination showed that it was a complex choristoma composed of lacrimal gland, adipose tissue, and myxomatous tissue. The latter has not been described previously in this disorder. This neuro-oculocutaneous syndrome has been considered one of the phakomatoses.