Impressive pseudotumoral proliferative nodules in a giant congenital nevus of a newborn.

The potential for malignant transformation of a giant congenital melanocytic nevus (GCMN), although rare, should be considered, especially in proliferative lesions that have nodules on their surface, as they can clinically and histologically mimic melanoma and generally have a poor prognosis. We present the case of a newborn boy with a giant nevus of uneven blackish color on the back with variable degrees of intensity of pigmentation, almost entirely covered by nodules of large and variable sizes, soft texture, and a tendency to ulcerate and bleed. The unusual clinical and histologic appearance made the case particularly interesting and featured a not well-defined biologic behavior, thus deserving a radical surgical approach to fulfill diagnostic and therapeutic aims.

Bilateral Nipple Enlargement as a Secondary Effect of Anabolic Drugs: A Histopathological Mimicker of Smooth Muscle Hamartoma.

Smooth muscle hamartoma are usually solitary and congenital, may affect the genital area and nipples. Histopathologically, they are characterized by the presence of mature smooth muscle bundles. We present a 40 year-old male with bilateral nipple enlargement excised with clinical suspicion of bilateral leiomyoma. Skin biopsy shows mature, irregularly arranged smooth muscle bundles and lactiferous ducts between them. Immunohistochemistry is positive for smooth muscle actin, desmin and fumarase, but negative for estrogen and progestogen receptors. The presence of lactiferous ducts excludes bilateral leiomyomas. Even when, histopathologically, this can be interpreted as the nipple-type of muscular hamartoma of the breast, clinical history favors an anabolic drug-induced lesion. Bodybuilders present gynecomastia and nipple enlargement as frequent problems, but we have not found any histopathological description of these nipple lesions. We consider that dermatologists should be aware of the presence of them and dermatopathologists should know their histopathological features to avoid misdiagnosis as neoplasms.