title: Myositis ossificans circumscripta: a benign lesion with a malignant differential diagnosis.
abstract: Localized areas of active myositis ossificans, occurring without a clear history of antecedent trauma, have been referred to as a "pseudo-malignant osseous tumor of soft tissue." This lesion may be mistaken both roentgenographically and pathologically for a malignancy. The roentgenographic signs which favor a diagnosis of non-neoplastic heterotopic bone formation include a lucent zone between the lesion and the adjacent bone, an intact underlying cortex, diaphyseal location, dense calcification in the periphery, and loss of volume on serial films.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D003937:Diagnosis, Differential; D005260:Female; D006621:Hip Joint; D006801:Humans; D007596:Joints; D008297:Male; D008875:Middle Aged; D009221:Myositis Ossificans / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D010386:Pelvic Neoplasms / Q000175:diagnosis / Q000000981:diagnostic imaging / Q000473:pathology; D011859:Radiography; D012509:Sarcoma / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology; D012782:Shoulder; D012983:Soft Tissue Neoplasms / Q000175:diagnosis* / Q000000981:diagnostic imaging / Q000473:pathology