Spondyloarthritis and Tietze's syndrome: A re-evaluation.

Spondyloarthritis (SpA) comprises a number of related but different disorders with distinct phenotypes: psoriatic arthritis, reactive arthritis, arthritis related to inflammatory bowel disease, undifferentiated arthritis, and ankylosing spondylitis (the well-known prototypic subtype). Differentiating rheumatic diseases, such as rheumatoid arthritis, synovitis-acne-pustulosis-hyperostosis-osteitis syndrome, pustulotic arthro-osteitis, gout, and SpA, is difficult because they all may manifest swelling at the upper anterior chest wall, often involve the sternocostal and/or sternoclavicular joints, and clearly show cutaneous nodular symptoms, so that they may mimic Tietze's syndrome in the presentation. Tietze's syndrome is a benign, self-limiting entity with tender, non-suppurative swelling in the upper anterior chest wall, especially at the second and third costosternal junctions and the sternoclavicular joint. Therefore, distinguishing SpA from Tietze's syndrome during an entire disease course is important, even after an initial tentative diagnosis. This article aims to re-evaluate the importance of Tietze's syndrome in the differential diagnosis of SpA, while keeping in mind information about rheumatic diseases affecting the upper anterior chest wall.