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Image A = Computed tomography (CT) scan of the sacroiliac joints in a patient with inflammation of the joints (arthritis) shows destruction of the cartilage and bones demonstrated by joint space widening (straight arrows) and bone break up (curved arrows).

Image B = Computed tomography (CT) scan of a patient with normal, thin sacroiliac joints demonstrated by the space between the arrows.

Note: Images are shown for illustrative purposes. Do not attempt to draw conclusions or make diagnoses by comparing these images to other medical images, particularly your own. Only qualified physicians should interpret images; the radiologist is the physician expert trained in medical imaging.