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PM is closely associated with the other short hip rotators that lie inferior such as the superior gemellus, obturator internus, inferior gemellus and obturator externus 8. Due to its large volume in the greater sciatic foramen, it has the potential to compress the numerous vessels and nerves that exit the pelvis. The nerves and blood vessels in the suprapiriform foramen are the superior gluteal nerve and vessels, and in the infrapiriforma fossa are the inferior gluteal nerves and vessels and the sciatic nerve (SN) 7. As it courses antero-laterally through the greater sciatic foramen, it tapers out to form a tendon that is attached to the superior-medial surface of the greater trochanter, commonly blending with the common tendon of the obturator internus and gemelli muscles 6. PM is a thick and bulky muscle, and as it passes out of the pelvis through the greater sciatic foramen, it divides the foramen into the suprapiriform and infra-piriform foramina 5. Occasionally its origin may be so broad that it joins the capsule of the sacroiliac joint above and with the sacrotuberous and/or sacrospinous ligament below 3 4. The PM originates on the anterior surface of the sacrum and is anchored to it by three fleshy attachments between the first, second, third and fourth anterior sacral foramina 2.