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[Synovial biopsy: expectations, results and assessment].

In arthropathies without clear diagnostic clinical, radiological and laboratory findings, a synovial biopsy should be performed. The histologic examination yields a diagnosis in 5 to 29% or is complementary to clinical, radiological and laboratory findings leading to the diagnosis in another 23 to 40%; the diagnosis of "chronic synovitis" results at best for the remaining cases. The histological features of the main types of arthritis and arthropathy are briefly discussed.