title: The pyriformis syndrome -- report of four cases and review of the literature.
mesh_terms: D000328:Adult; D002081:Buttocks / Q000601:surgery; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009408:Nerve Compression Syndromes / Q000601:surgery*; D012584:Sciatic Nerve / Q000601:surgery*; D013710:Tendons / Q000601:surgery*