Heterotopic Ossification of the Peroneus Longus Tendon in the Retromalleolar Portion with the Peroneus Quartus Muscle: A Case Report

Figure 3

Sagittal T1- and T2-weighted MR images showed an elliptical mass of low intensity partially with high intensity with no contrast effect. Axial T1-weighted MR images showed a low-intensity mass (yellow arrow) in the peroneal tendon sheath, which seemed to compress both the peroneal brevis and longus tendons. (a) Sagittal T1-weighted image. (b) Sagittal T2-weighted image. (c) Sagittal enhanced image. (d) Axial T1-weighted image.

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