The article presents up-to-date data concerning etiopathogenesis, clinical manifestations and diagnosis of chronic non-bacterial osteomyelitis in children. Chronic relapsing multifocal osteomyelitis (CRMO) is a rare condition with unknown etiology, which is characterized by presence of numerous relapsing focuses of bone destruction. Diagnostic work-up for CRMO includes magnetic resonance imaging (MRI) and bone scintigraphy, blood culture and bone biopsy. The diagnosis of CRMO can be made if negative results of blood culture and bone biopsy material are observed and bone malignancy and infection are ruled out. Main therapeutic approaches and follow-up are given in the article. Clinical case of CRMO in combination with juvenile idiopathic arthritis (JIA) in a ten year old boy is described. CRMO should be considered and differential diagnosis should be done in cases of atypical course of JIA especially in those with absence of specific immunological markers.
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