Part 4 · Bones and Joints
Same concept, other depth: Clinical Reasoning →
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A 24‑year‑old man has had low back pain for a year that is worse in the morning and better with exercise. His pelvic X‑ray shows blurred, eroded sacroiliac joints on both sides. An MRI shows bone inflammation there. He is HLA‑B27 positive: ankylosing spondylitis.
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