Metastatic renal cell carcinoma to the mandible: a case report with clinical and histologic findings.

Metastatic disease to the oral cavity is rare. Patients with metastasis to the oral cavity may present with swelling, pain, and paresthesia and require evaluation by providers trained in managing pathoses of the oral cavity and surrounding structures. This report describes the case of a 78-year-old man with painful enlargement of the right posterior mandible that caused paresthesia. An open biopsy procedure resulted in significant blood loss and the need for percutaneous needle biopsy. Immunohistochemical analysis was used to make the diagnosis of metastatic clear cell renal cell carcinoma in this patient, whose primary malignancy was previously unknown. Composite resection of the metastatic lesion and reconstruction were performed with the use of virtual surgical planning, an osteomyocutaneous free tissue transfer, and a custom reconstruction plate. This case highlights the importance of dental professionals in the diagnosis and management of lesions of the head and neck and adds to the literature on metastatic lesions to the region.