Carcinosarcoma of the mandibular mucosa: the first report.

A 67-year-old man was referred with a squamous cell carcinoma of the left mandibular alveolar ridge verified elsewhere by an exploratory excision. After extensive staging and preoperative irradiation, a radical surgical attempt was performed. Histopathological examination and immunohistochemical analysis revealed the first case of a carcinosarcoma of the mandibular alveolar ridge. Clinical and histopathological features are presented, and treatment and prognosis are discussed.