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ModerateRheumatologyAxial Spondyloarthritisus-abfmus-abimus-usmle-step-2

A 35-year-old man presents with a 2-month history of low back pain that improves with exercise and worsens with rest. He has morning stiffness lasting more than 45 minutes. Exam shows decreased lumbar flexion and tenderness over the sacroiliac joints. What is the most appropriate initial imaging study?

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