Malignant hemangiopericytoma of the gingiva: report of a case.

A case of malignant hemangiopericytoma arising in the left maxillary gingiva in a 2-year-old boy is presented. This represents an extremely rare intraoral lesion that is impossible to diagnose clinically. Histologic diagnosis was made by use of special staining techniques, immunohistochemical stains, and electron microscopic evaluation. This tumor shows a high incidence of local recurrence with a poor prognosis. The mainstay of treatment is wide local excision and adequate postoperative follow-up.