Basal cell carcinosarcoma: a report of 4 cases and review of the literature.

Background: To describe the features of 4 cases of basal cell carcinosarcoma and systematically review previously reported cases.

Methods: Four cases of basal cell carcinosarcoma were identified from the practice of the authors. A search of the literature revealed an additional 40 cases, variously described in small series and single case reports.