Case description:
We report the case of a 30-year-old man who presented with acute arthritis occurring two months after an episode of urethral discharge. Physical examination revealed polyarthritis, dactylitis, sacroiliac joint involvement, and plantar papulosquamous plaques. The human leukocyte antigen B27 was positive. Detection of chlamydia trachomatis and Gonococcus in the first catch urine specimen was negative. Hepatitis B and C, chlamydia trachomatis, Human Immunodeficiency Virus and syphilis serologic test results were negative. Pelvic magnetic resonance imaging revealed left sacroiliitis. The patient was treated with antibiotics, diclofenac, and sulfasalazine. After six months of follow-up, a significant clinical improvement was obtained without remission, suggesting an evolution to chronic spondylarthritis.