Malignant hemangioendothelioma (angiosarcoma).
D003937:Diagnosis, Differential; D006338:Heart Neoplasms; D006394:Hemangiosarcoma / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008339:Mandibular Neoplasms / Q000175:diagnosis*; D008875:Middle Aged; D009362:Neoplasm Metastasis