A case of malignant hemangiopericytoma/ solitary fibrous tumor of the mandible

Abstract

We report a case that was suspected to be a metastatic mandibular tumor of renal cell carcinoma, but was finally diagnosed as hemangiopericytoma (HPC)/ solitary fibrous tumor (SFT) of the mandible. The patient was a 79-year-old woman who was referred to our clinic because of a painful swelling in the lower right side of the mandible. She had a history of dementia and surgery for renal cell carcinoma. Panoramic radiography showed bone resorption extending from the mandibular body to the ramus of the mandible. The clinical diagnosis was a suspected metastatic tumor from renal cell carcinoma. On confirming the pulsation on the right mandibular gingiva, we predicted considerable bleeding during operation. Selective transcatheter arterial embolization was performed before surgical excision. Intra-arterial digital subtraction angiography showed remarkable tumor staining in the region of the right facial and inferior alveolar arteries. After selected embolization, the tumor was removed surgically. The histopathological diagnosis was a malignant HPC. Ten months after discharge, the patient died of advanced dementia and debilitation.