Reactive arthritis (seronegative spondyloarthropathy)

HIGH-YIELD Appears 1×

Teaching point

A young adult with recent diarrhoea, orogenital ulcers, asymmetric arthritis and dactylitis (sausage finger) fits reactive arthritis (HLA-B27 associated). Behcet causes recurrent ulcers without dactylitis and is not post-infectious; HIV does not cause specific dactylitis. The post-GI trigger and dactylitis distinguish reactive from psoriatic arthritis.

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