Figure 13a. (a) Normal anatomy of the anterior tarsal tunnel. Proton-density-weighted MR image (3,500/19) shows the anterior tibial tendon (large arrowhead), extensor hallucis longus muscle and tendon (thick arrow), inferior extensor retinaculum (small arrowheads), dorsal pedis artery, and lateral and medial terminal branches of the DPN (thin arrows). (b) Inflammatory arthritis and multiple tenosynovitis in a patient with vague foot pain and swelling. Contrast-enhanced fat-saturated T1-weighted MR image (700/12) shows tenosynovitis of the extensor digitorum longus tendon (arrowhead) and contrast material uptake surrounding the deep peroneal neurovascular bundle (arrow).