nodular melanoma, a melanoma that is nodular and uniformly pigmented, usually bluish-black, and sometimes surrounded by an irregular halo of pale, unpigmented skin. The lesion is always raised and may be dome-shaped or polypoid. Most often the tumor is found in middle-aged adults and occurs in 10% to 15% of patients with melanoma. See also lentigo maligna melanoma, superficial spreading melanoma.
