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Rupture of the popliteal cyst in gout. Case report.

Most cases of the rupture of the popliteal (Baker's) cyst have been described in patients with rheumatoid arthritis (1, 2, 6, 8). Case reports of the cyst rupture in other diseases, such as psoriatic arthritis (4), Reiter's disease (5,9) and osteoarthritis (8) are rare. Gouty arthritis of the knee joint has been mentioned only rarely as causing the development of the popliteal cyst (3, 7), but to our knowledge there have been no reports of its rupture in gout. For that reason a patient is now reported with chronic gout and rupture of the popliteal cyst.