Tarsal tunnel syndrome in seronegative spondyloarthropathy.

A 53-year-old man affected by ankylosing spondylitis associated with psoriasis developed bilateral tarsal tunnel syndrome caused by synovitis of the accompanying sheaths of the tendons that run through the 'fibro-osseous tunnel'. This report confirms the hypothesis that the tarsal tunnel syndrome may be a clinical manifestation of seronegative spondyloarthropathy.