Sacroiliitis on accessory sacroiliac joint
Right pelvic pain referred for ct of the lumbo-sacral spines. Extra images on the pelvis were recommended.
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An accessory sacroiliac joints between the posterior aspect of the right sacral ala and an osseous projection of the iliac bone, demonstrates subchondral sclerosis with narrowed joint space.
This case nicely demonstrates arthritic changes of right Accessory sacroiliac joint, which was responsible for the patient's symptoms. The examined spine was unremarkable.