Abstract
A 74-year-old man noticed a macule on the right side of his back in July 2001. The macule gradually increased in size thereafter. After visiting a clinic, he was referred to us. The macule was brown-reddish, slightly elevated, with a red nodule. We diagnosed the lesion as a poroma (Smith-Coburn type) based on histological examination of the nodule. We then excised the entire lesion. Histopathologically the macular lesion had histological features of seborrheic keratosis (clonal type) associated with poroma (Smith-Coburn type). This case is considered very rare.
