<prompt> Primary idiopathic polymyositis does not involve:Pelvic girdle musclesNeck musclesOcular musclesPharyngeal muscle  <response>: Ans. is c Ocular muscles Muscular involved in polymyositis areIt chiefly involves proximal muscles of the limb girdles.Pharyngeal and respiratory muscles are involved in severe cases.Presence of any of the following factors rule out the diagnosis.Polymyositis:Involvement of extraocular facial musclesRashFamily history of neuromuscular are diseaseHistory of exposure of myotoxic drugs or toxinsEndocrinopathyMuscular dystrophy 