From the case:
Snapping iliopsoas tendon diagram
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Two common mechanisms for a snapping iliopsoas tendon are illustrated, corresponding to an axial oblique ultrasound slightly above the level of the femoroacetabular joint.
*entrapped portion of iliiopsoas muscle
LH: lateral head of tendon (iliacus tendon)
MH: medial head of tendon (psoas tendon)
Curved arrows show the direction of movement of the tendon creating the snap against the iliopectineal eminence.