A comorbidity of ulcerative colitis, ankylosing spondylitis, Takayasu's arteritis and silent thyroiditis: an extensive case-based review.

Ulcerative colitis is a chronic condition characterized by continuous inflammation of the rectum and colon. Its clinical complications extend beyond the gastrointestinal tract to involve multiple systems, including musculoskeletal, hepatobiliary, cardiovascular, and ocular manifestations. Takayasu arteritis and ankylosing spondylitis are two autoimmune inflammatory disorders that have previously been reported as coexisting conditions associated with ulcerative colitis. is an autoimmune-mediated inflammation of the thyroid gland causing the release of thyroid hormones and is considered a variant form of chronic autoimmune thyroiditis (Hashimoto's thyroiditis). The authors report a case of a 32-year-old Caucasian man with a 3-year history of ulcerative colitis who presented to our clinic in 2015, complaining of chronic lower back pain that alleviates with exercise but does not relieve with rest. Based on our physical exam findings and lab results, ankylosing spondylitis was diagnosed using Assessment of Spondylarthritis International Society and New York criteria. Computerized tomography angiography was performed and demonstrated stenosis in multiple arteries. These findings satisfied the American College of Rheumatology criteria for Takayasu's disease. After the Infliximab was started, the patient had significant symptomatic improvement. The use of biological therapy plays a key role in the treatment of many autoimmune illnesses. The patient was considered resistant and nonresponsive to treatment; thus, biological therapy was indicated, and infliximab was administered, resulting in a significant clinical improvement and remission of all illnesses. The authors aim to report a rare coexistence of ulcerative colitis, ankylosing spondylitis, Takayasu's arteritis and silent thyroiditis. And the authors believe this can aid in diagnosing and management of rare diseases.