Abstract
We report the case of a female patient (age 59) presenting with an ulcerative tumor on her parietal region. The lesion was highly suspected of being malignant based on the clinical features, however, it was thereafter histologically determined to be a proliferating trichilemmal tumor (PTT). In addition, we also collected previous Japanese case-reports on both PTT and malignant PTT, and we discuss the differential diagnosis of both.
