Traumatic myositis ossificans.
D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008406:Masseter Muscle / Q000293:injuries* / Q000473:pathology; D008410:Masticatory Muscles / Q000293:injuries*; D008875:Middle Aged; D009221:Myositis Ossificans / Q000209:etiology* / Q000473:pathology; D012516:Osteosarcoma / Q000473:pathology