Nipple leiomyoma: A rare neoplasm with a broad spectrum of histologic appearances.

Cutaneous leiomyomas are rare benign smooth-muscle tumors. These lesions are distinguished based on their cell of origin and are subclassified as pilar leiomyoma, angioleiomyoma, and genital-type leiomyoma. Nipple leiomyoma is the least common genital-type leiomyoma, arising from the dartoic muscle cell of the nipple. Histologic examination of the lesion is necessary for definitive diagnosis, and these uncommon tumors can pose a diagnostic challenge. We describe herein a series of six nipple leiomyomas with a spectrum of histologic appearances.

Spontaneous involution (regression) of a solitary cutaneous myofibroma in an adult patient.

Myofibromas are unusual benign tumors most commonly seen in infant children. Clinical involution of the tumor often occurs within the first few years of life. Solitary cutaneous myofibroma is the synonymous adult counterpart of infantile myofibromatosis. Although solitary myofibromas have been reported in patients of all ages, only the infantile variant is believed to regress spontaneously. There are only a few case reports of adolescent and young adult patients with regressing solitary lesions that have been described in the literature to date. We report a 71-year-old male with spontaneous regression of solitary cutaneous myofibroma. The residual lesion was excised and to date has not recurred. This report describes the historical, clinical and histopathological features of adult myofibromas and a novel manifestation that may guide future clinical considerations when approaching solitary tumors with regressive features.