A malignant skin neoplasm that seldom metastasizes but has potentialities for local invasion and destruction. Clinically it is divided into types: nodular, cicatricial, morphaic, and erythematoid (pagetoid). They develop on hair-bearing skin, most commonly on sun-exposed areas. Approximately 85% are found on the head and neck area and the remaining 15% on the trunk and limbs. (From DeVita Jr et al., Cancer: Principles & Practice of Oncology, 3d ed, p1471)

Synonyms: Carcinomas, Basal Cell, Epitheliomas, Basal Cell, Rodent Ulcers, Carcinoma, Basal Cell, Ulcers, Rodent, Rodent Ulcer, Epithelioma, Basal Cell, Basal Cell Epithelioma, Basal Cell Carcinoma, Basal Cell Carcinomas, Basal Cell Epitheliomas, Ulcer, Rodent, Carcinoma, Basal Cell, Pigmented