Abstract
Solitary trichoepithelioma is a benign, solitary follicular neoplasm that occurs mainly on the face, but rarely arises in the oral region. A case of solitary trichoepithelioma of the upper lip is reported.
A 41-year-old man was referred to our department on June 8, 1994, because of swelling of the upper lip and purulent discharge from the extraction socket of the left maxillary second molar. The lesion measured 6×5×4 mm and was covered with normal mucosa with no sign of ulceration. The clinical diagnosis was a benign tumor of the lip. In addition, the presence of a postoperative maxillary cyst was confirmed radiographically. With the patient under general anesthesia, the maxillary cyst and the tumor of the lip were removed. Microscopic exmination showed keratotic cysts with a tendency to pilar formation and islands of basaloid cells embedded in an abundent subepidermal stroma. The histopathological diagnosis was a solitary trichoepithelioma. There has been no evidence of recurrence as of 48 months after operation.
