Korean J Med.  2014 Feb;86(2):258-262.

A Case of Polymyositis with Normal Creatine Kinase

Affiliations
  • 1Department of Internal Medicine, Hallym University College of Medicine, Chuncheon, Korea. agnes@hallym.or.kr
  • 2Department of Pathology, Hallym University College of Medicine, Chuncheon, Korea.
  • 3Department of Radiology, Hallym University College of Medicine, Chuncheon, Korea.

Abstract

Proximal muscle weakness can be induced by many diseases, such as muscular dystrophies, inflammatory muscle diseases, and polymyalgia rheumatica. Differential diagnosis of these diseases is important. The patient had proximal muscle weakness with a normal creatine kinase (CK) level. Our initial diagnosis was polymyalgia rheumatica because the CK level was normal. The patient was treated with low-dose corticosteroid. However, the muscle weakness did not improve. The diagnosis of polymyositis was confirmed by a muscle biopsy. We suggest that if the patient has typical symptoms with normal CK, then evaluations for inflammatory muscle diseases are essential.

Keyword

Polymyositis; Creatine kinase; Aldolase

MeSH Terms

Biopsy
Creatine Kinase*
Creatine*
Diagnosis
Diagnosis, Differential
Fructose-Bisphosphate Aldolase
Humans
Muscle Weakness
Muscles
Muscular Dystrophies
Myositis
Polymyalgia Rheumatica
Polymyositis*
Creatine
Creatine Kinase
Fructose-Bisphosphate Aldolase
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