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Diagnosis of Behçet's disease in a non-endemic region: the utility of the urate skin test.

Sporadic cases of Behçet's disease in non-endemic regions pose a diagnostic challenge and may be confused with other more common chronic, relapsing multisystem disorders. The urate skin test, an exaggerated inflammatory reaction to intradermally injected monosodium urate crystals, may add a level of diagnostic specificity to a disease which otherwise lacks pathognomonic clinical features.