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Fig. 4. —Type I superior peroneal retinacular injury in 44-year-old man after ankle sprain. Axial spin-echo proton density image (TR/TE, 1,183/30) shows pouch formed by stripped-off periosteum and superior peroneal retinaculum (thin solid arrows). Peroneus brevis and longus tendons (thick arrow) are dislocated into pouch. Fibular groove (open arrow) is flat.