Cutaneous malignant melanoma associated with extensive pseudoepitheliomatous hyperplasia. Report of a case and discussion of the origin of pseudoepitheliomatous hyperplasia

We report a case of cutaneous malignant melanoma associated with extensive pseudoepitheliomatous hyperplasia. Pseudoepitheliomatous hyperplasia may mi mic squamous cell carcinoma and may complicate the diagnosis of cutaneous m elanoma, This diagnostic pitfall is important to both recognize and be cogn izant of, so as to avoid diagnostic errors. The observation of the pseudoep itheliomatous hyperplasia, in this case with an extensive proliferation of eccrine ducts, provides further evidence that cutaneous pseudoepitheliomato us hyperplasia arises within the eccrine apparatus.