Idiopathic inflammatory myopathy: difficulties in early diagnosis

A clinical case of polymyositis in a 34-year-old patient is considered. The clinical picture, laboratory and instrumental examination data are described. The complexity of diagnosing idiopathic inflammatory myopathies (IIM) lies in the heterogeneity of symptoms, which may be similar to more common rheumatological, endocrine, neurological and oncological diseases, which often leads to an incorrect diagnosis, and as a result, delayed pathogenetic and etiotropic treatment. Also not unimportant is the rarity of the occurrence of IIM 9.63 per 1,000,000 of the population and low awareness among non-core specialists about this category of diseases.