Presentation
Recent trauma
Patient Data
Well-circumscribed peripherally calcified lesion in the medial side of left thigh separate from the underlying pubis and ischium.
MR images show isosignal T1W and heterogeneous signal T2W oval-shaped mass-like lesion located at the medial side of the left thigh within the adductor muscle group with marked surrounding edema.
The lesion has a peripheral low signal rim due to calcification or mineralization. The lesion is detectd adjacent to the left inferior pubic ramus without causing bone remodeling or destruction.
After contrast injection , heterogeneous enhancement of this lesion is defined.
Case Discussion
Findings are most in keeping with myositis ossificans.
Myositis ossificans is the most common form of heterotopic ossification, usually within large muscles. Its importance stems in large part from its ability to mimic more aggressive pathological processes. Myositis ossificans is one of the skeletal “don’t touch” lesions.
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