Pseudotumor

Sometimes patients do not recall muscle injury and may present several months later with a small painless mass in the anterior thigh. While consideration for sarcoma may exist, MR may detect pseudotumors related to chronic rectus femoris tear. In one case series with normal x-rays without soft tissue calcification or periostitis, MR showed an irregular mass (usually less than 5 cm) with edema and some enhancement compatible with pseudotumors [53]. Short-term follow-up imaging may be needed to help distinguish pseudotumor from soft tissue malignancy [52].

While not a true muscle injury, shear injuries ofthe deep subcutaneous tissues and muscle-fascial interface may occur resulting in fluid collections known as Morel-Lavallee lesion or degloving injuries, which can mimic tumors (originally described as posttraumatic cysts) particularly when chronic [54,55] (Fig. 13).

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