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Fig. 1D —Left hip iliopsoas tendon snapping over iliac muscle in 29-year-old man. Video recording of this case (Fig. S1E) can be seen in the AJR electronic supplement to this article, available at www.ajronline.org, and presents more detail than the images printed here. At one point, muscle (arrowhead) is suddenly released laterally, allowing abrupt return of iliopsoas tendon (arrow) against superior pubic ramus (SPR), producing audible snap.