A Case of Giant Apocrine Hidradenoma

Hidradenoma is a relatively rare benign cutaneous tumor of sweat gland origin showing eccrine (eccrine or poroid hidradenoma) or apocrine (apocrine hidradenoma) differentiation. It usually presents as a slowly growing solitary nodule measuring between 0.5 and 2 cm in diameter. The large variant is rare, but may occur when they grow without appropriate treatment for several years. We report a case of apocrine hidradenoma in a 67-year old woman who presented with a solitary, erythematous, pedunculated, giant mass measuring 10.5×6.7×4.0 cm in size on the left lateral aspect of frontal scalp for 10 years. This is the largest among reported cases in the Korean literature. (Korean J Dermatol 2008;46(8):1056∼1060)