Figure 29. Tarsal tunnel syndrome: ganglion. Photograph (bottom) shows the area scanned. A 28-year-old woman complained of a painful sensation with radiation to the foot during compression of the medial aspect of the right ankle. US of the medial malleolus in transverse (Tr) and sagittal (Sag) views shows an anechoic ganglion (arrowheads) with compression of the posterior tibial nerve (arrows). A = posterior tibial artery.