The study reveals joint space narrowing at inferior aspect of right sacroiliac(SI) joint with joint effusion and diffuse enhancing synovial lining, representing synovitis. There is subchondral abnormal signal intensity with enhancement at opposed right sacral and iliac bone with irregular articular surfaces, representing osteitis.
Left SI joint shows narrowed joint space at inferior aspect without joint effusion. Edema and enhancement at the inferior aspect of the left SI joint is also seen, representing osteitis. There is subchondral bone erosion with fat deposition at superior aspect of opposed left sacral and iliac sides and subchondral bone sclerosis at left iliac bone. No bony ankylosis is seen at bilateral SI joints.
Normal contour of bilateral femoral heads without abnormal marrow signal intensity or subchondral fracture. No significant hip joint effusion is seen, bilaterally. Pubic symphysis is intact. There is no significant abnormal fluid in bursae around both hips. Both femora and the rest of pelvic bone show normal marrow signal intensity without cortical destruction. The visualized spine shows no definite bone erosion or abnormal signal intensity.
Subcutaneous tissue at both hips and thighs are unremarkable.
The visualized neurovascular bundles around both hips are intact. There is no significant lymph node enlargement. No intraabdominal fluid collection is detected.
- Joint space narrowing at inferior aspect of right sacroiliac (SI) joint with diffuse synovitis and osteitis of subchondral sacral and iliac bone, representing active sacroiliitis.
- Joint space narrowing at inferior aspect of the left SI joint with osteitis, reapresening active sacroiliitis.
- Subchondral bone sclerosis at superior aspect of left sacrum, erosion and fat deposition of superior aspect opposed left sacral and iliac bone, representing inactive sacroiliitis.