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Fig. 3D —Right hip bifid iliopsoas tendon with medial and lateral heads snapping over one another in 13-year-old girl. Video recording of this case (Fig. S3E) 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, close to neutral position of hip, true medial head (arrow) is suddenly released over lateral head (arrowhead) against superior pubic ramus (SPR), producing second audible snap.