Learning objectives
To illustrate the radiological appearance of myositis ossificans.
To highlight the suggestive features helping distinguish it from more aggressive pathological processes.
Background
MYOSITIS OSSIFICANS
Myositis ossificans is a pseudo-inflammatory tumor that originates from skeletal muscle and corresponds to a heterotopic,
metaplastic,
nonmalignant bone tumor with an unknownpathogenesis.
Myositis ossificans might develop secondary to a muscular trauma but often there is not a clear history of injury and the diagnosis of a solitary mineralized soft-tissue mass is incidental.
Myositis ossificans has a rich cortege of clinical symptoms but one common presentation is as an inflammatory,
rapidly-growing,
and painful muscular mass with joint stiffness ,
usually following blunt soft-tissue...
Findings and procedure details
We retrospectively reviewed our radiologic archives and literature to illustrate the radiological features of myositis ossificans,
helping distinguish it from more aggressive pathological processes,
such as parosteal osteosarcoma and synovial sarcoma according to different imaging techniques.
CT/Plain radiograph
MYOSITIS OSSIFICANS
Myositis ossificans at plain radiographs in the first 2 weeks is typically normal, occasionally only with the evidence of periosteal reaction,
possibly because of associated subperiosteal hematoma; soft-tissue calcifications begin to become apparent radiographically at approximately 3 to 4 weeks.
In the early phase the...
Conclusion
Early and correct diagnosis of soft-tissue calcified masses is fundamental for indication of proper management of the disease.
References
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(2010) Highly malignant soft tissue sarcoma of the extremity with a delayed diagnosis.
World Journal of Surgical Oncology 8:84
ZafiriaGPapathanassiou et al.
(2011) Parosteal osteosarcoma mimicking osteochondroma: A radio-histologic approach on two cases.
Clinical Sarcoma Research 1:2
Mark D et al.
(2006) Imaging of Synovial Sarcoma with Radiologic-Pathologic Correlation.
Radiographics
Gail Yarmish et al.
(2010)Imaging Characteristics of Primary Osteosarcoma: Nonconventional Subtypes.
Radiographics 30:1653–1672
CHANGHUA LIANG et al.
(2015) Synovial sarcoma: Magnetic resonance and computed tomography imaging features and differential diagnostic considerations.9(2): 661–666....