<unk><unk>  (PMR) is a chronic inflammatory disease of the articular and periarticular structures of the cervical region, shoulder girdle and hip girdle. The underlying<unk>  of PMR remains unknown. It has been hypothesized that genetic and environmental factors are implicated, particularly due to the seasonal and geographical differences in the prevalence of this disease. It has also been hypothesized that PMR is associated with infections such as parainfluenza virus type 1, mycoplasma pneumoniae, chlamydia pneumoniae, and parvovirus B19. In addition, histological examinations of synovial biopsies of affected individuals reveal mild synovitis with predominance of CD4 T cells and macrophages. Although myalgia is a symptom of PMR, there is no inflammation of the muscles.
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