A Case of Congenital Smooth Muscle Hamartoma / 대한피부과학회지

ABSTRACT

Congenital smooth muscle hamartoma(CSMH), a rare congenital benign tumor of the skin, usually appears at birth as skin colored or slightly hyperpigmented patches or plaques, sometimes with lightly pigmented vellus hairs. Histopathologically it has a marked hyperplasia of well-demarcated smooth muscle bundles in the dermis. We report a case of CSMH in a 4-month-old male infant, who had had hypertrichosis, rippling and multiple light brown colored macules on both his lower extremites since birth. Histopathologically, markedly proliferated smooth muscle buildles were scattered throughout the retucular dermis.