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Soft tissue involvements are the most common types of RHEUMATIC DISEASES. The PREVALENCE of PERIARTHRITIS in a study in the USA was 20-30% of all RHEUMATIC DISEASES. The aim of this study was to estimate the PREVALENCE, type, topography and treatment in these disorders. This cross-sectional descriptive study was done on 1600 files of patients that were visited in rheumatology center of Shariati Hospital between 1996-2002. The samples were selected randomly and systematically and the data were extracted. The PREVALENCE of PERIARTHRITIS was estimated 16.25%(260 cases). Most of the cases with PERIARTHRITIS were found in the age group of 40-50 years (26.6%) and the mean of age was 46.48±13.86. About 78.5% of patients were female and 21.5% were male. The most common forms of PERIARTHRITIS were tendonitis and bursitis (64.6%) and the second rate was neurovascular (23.6%). The most frequent disease was carpal tunnel syndrome 21.9% and shoulder capsulitis (13.5%). Right upper limb and wrist (26.2%) were the most frequent sites of involvement and the rate of bilateral carpal tunnel was 42%. The rheumatic disease, as background, was found in 17.3% of patients. Bilateral carpal tunnel syndrome was the most frequent type of bilateral PERIARTHRITIS which was statistically significant (p< 0.001). As the results showed PERIARTHRITIS diseases are very common, specially carpal tunnel syndrome and shoulder capsulitis. The future studies need to evaluate the response to treatment, job; and trauma must be considered …