title: Extraskeletal Osteosarcoma. Case report and differential diagnosis.
abstract: In this case of an extraskeletal osteosarcoma initially there were typical difficulties in diagnosing a) a malignant mesenchymal tumor and b) a bone-producing tumor. Only focally the test-booking findings of an osteosarcoma were present. The differential diagnosis concerned mainly pseudosarcomatous lesions with bone formations, which histologically may appear suspicious, however, follow a benign course clinically.
mesh_terms: D000368:Aged; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D012516:Osteosarcoma / Q000175:diagnosis* / Q000473:pathology; D012983:Soft Tissue Neoplasms / Q000175:diagnosis* / Q000473:pathology; D013848:Thigh / Q000473:pathology