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. 2010 May 4;30(3):751–761. doi: 10.1148/rg.303095756

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Figure 11c — Predominantly anteromedial impingement in a 39-year-old man with recalcitrant medial ankle pain and instability. (a) Anteroposterior radiograph of the ankle shows heterotopic bone formation (arrow) in the medial tibiotalar space. (b) Coronal intermediate-weighted MR image shows heterotopic bone formation in relation to the ATTL (arrow), with amorphous signal intensity. (c) Coronal T2-weighted fat-saturated MR image shows abnormal high signal intensity (arrow) in the region of the ATTL that is due to synovial proliferation and fibrosis. (d) Axial intermediate-weighted MR image shows amorphous signal intensity in both the ATTL and the PDTL, with heterotopic bone formation (arrow) in relation to the ATTL.