A case of multiple pilar tumors and pilar cysts involving the scalp and back.

The case of a patient with multiple proliferating trichilemmal tumors and trichilemmal cysts of the scalp and back is discussed. The multicentric presentation of this tumor is unusual and, to our knowledge, has not been described previously. The appearance of trichilemmal cysts in association with multiple proliferating trichilemmal tumors suggests a common histogenesis of these two neoplasms. The typical presenting features, histologic description, and recommended treatment for these tumors are reviewed.