US-guided treatment of peroneal tenosynovitis on a short axis. (a) Probe and patient position to perform US-guided treatment of peroneal tenosynovitis. (b) Anatomical scheme and (c) US image of needle insertion within peroneal tendon sheath, C calcaneus, T tibia, F fibula, P peroneal tendons, arrow needle tip. (d) Steroid injection (asterisks)