LINEAR ECCRINE POROMA

A 44 yr old woman had multiple papular lesions of 20 yr duration. The lesions were limited to the right lower extremity and were arranged in a linear fashion. They had the histologic appearance of eccrine poroma. Thin intertwining strands of tumor cells extended into the dermis in a pattern similar to that of premalignant fibroepithelioma. Bud-like proliferations of tumor cells were attached to the epidermis, analogous to those of superficial basal cell epithelioma. A dilated cystic duct resembling that found in syringoma was present in the upper part of the dermis. Such a linear distribution of multiple eccrine poromas was not reported in the dermatologic literature.