Malignant proliferating trichilemmal tumor of the scalp: a case report.

Background: Malignant proliferating trichilemmal tumor is a rare skin tumor that affects mainly older women. It mimicks differential squamous cell carcinoma and its biological behavior is unpredictable.

Objective: To report on a new case of malignant proliferating trichilemmal tumor of the scalp and to describe the clinical and histopathologic findings.