Cutaneous melanoma of the breast.

A study of 115 cutaneous melanomas of the breast demonstrated that these neoplasms follow different metastatic patterns than do primary carcinomas of the breast and require a different therapuetic approach. Lesions located below a 3 cm from the clavicle metastasized exclusively to the axillary nodes regardless of location. None of 19 internal mammary node chains examined histologically contained tumor deposits. Microstaging of the primary lesion correlated closely with prognosis and lymph node metastasis. Treatment by mastectomy (radical, modified, extended radical) offered no advantage over local excision of the primary plus axillary dissection. The latter procedure is recommended for all cutaneous melanomas of the breast which require node dissection. Mastectomy is not indicated unless the breast is in the field of wide local excision. Internal mammary node dissections are not indicated.