Sir, The piriformis muscle has endopelvic origin, exits the pelvis through the greater sciatic notch and inserts into the piriformis fossa on the greater trochanter of the femur. Since the sciatic nerve also leaves the pelvis through the greater sciatic notch, any pathology of the piriformis muscle could result in the entrapment to the sciatic nerve, the piriformis syndrome.'11 Pyomyositis of the piriformis muscle can produce swelling of the muscle, resulting in compression of the sciatic nerve, thus can present with piriformis syndrome.'2'31 We report a rare case of pyomyositis of piriformis muscle presenting as sciatica.
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