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Figure 16b. Tarsal tunnel syndrome in a 61-year-old woman with a tibiotalar ganglion. Transverse 10-13-MHz US scan (a) and coronal T2-weighted MR image (2,000/80) (b) show a large ganglion (*) at the posteromedial ankle that displaces and expands around the tibial nerve (arrow), thus sustaining a compressive syndrome. T = talus.