RT Journal Article SR Electronic T1 Inflammatory myopathies: Narrowing the differential diagnosis JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 505 OP 519 VO 68 IS 6 A1 Rendt, Karen YR 2001 UL http://www.ccjm.org/content/68/6/505.abstract AB Muscle weakness is a feature of numerous conditions, but the muscle weakness of inflammatory myopathies, especially polymyositis and dermatomyositis, is easy to differentiate by specific clinical, laboratory, electromyographic, and histological features.