title: MR imaging and ultrasonography findings of early myositis ossificans: a case report.
abstract: Myositis ossificans (MO) is a benign soft tissue lesion with non-neoplastic heterotopic bone formation. MO in the intermediate and mature stages can be easily diagnosed if characteristic imaging findings such as a peripheral zonal pattern of ossification with variable thickness is observed. However, it is difficult to correctly diagnose early MO because it can mimic malignancy clinically, radiologically, and histopathologically. We report a case of early pseudosarcomatous phase of non-traumatic MO with atypical imaging findings. A 59-year-old woman presented with pain followed by a mass in the left thigh within a week. MR imaging and ultrasonography showed an intramuscular lesion with preserved muscle fascicles in the vastus lateralis muscle. Intralesional ossification or calcification was not seen on ultrasonography. A diagnosis of myositis ossificans was made by ultrasonographically guided biopsy.
authors: Department of Radiology, Jeju National University Hospital, Aran 13 gil 15 (Ara-1-dong), Jeju-si, Jeju Special Self-Governing Province, 63241, Republic of Korea.
authors: Kyung Ryeol
authors: KR
authors: Lee
authors: Department of Radiology, Kyung Hee University Hospital at Gangdong, 892, Dongnam-ro, Gangdong-gu, Seoul, 134-727, Republic of Korea. balgundol@hanmail.net.
authors: So Young
authors: SY
authors: Park
authors: Department of Radiology, Kyung Hee University Hospital at Gangdong, 892, Dongnam-ro, Gangdong-gu, Seoul, 134-727, Republic of Korea.
authors: Wook
authors: W
authors: Jin
authors: Department of Pathology, Kyung Hee University Hospital at Gangdong, 892, Dongnam-ro, Gangdong-gu, Seoul, 134-727, Republic of Korea.
authors: Kyu Yeoun
authors: KY
authors: Won
mesh_terms: D003937:Diagnosis, Differential; D018450:Disease Progression; D042241:Early Diagnosis; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008875:Middle Aged; D009221:Myositis Ossificans / Q000000981:diagnostic imaging / Q000473:pathology*; D052097:Quadriceps Muscle / Q000000981:diagnostic imaging* / Q000473:pathology*; D014463:Ultrasonography / Q000379:methods*
keywords: Magnetic resonance imaging; Myositis ossificans; Ultrasonography