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Case of the Week 581



What is the most likely diagnosis?

  • 36 year-old mother of four with back pain



Axial CT Scan of Pelvis

  1. Lead poisoning
  2. Ankylosing spondylitis
  3. Osteoblastic bone metastases
  4. Osteitis condensans ilii
  5. Reactive Arthritis

Additional Image - None

 

Additional Images

 


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Answer:

 

4. Osteitis condensans ilii

 

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Osteitis condensans ilii

General considerations

  • Benign sclerosis of the iliac side of the sacroiliac joints
  • Bilaterally symmetric
    • Rarely unilateral
  • Radiologic diagnosis discovered serendipitously
  • Usually found in young females who have had several children but also may be seen in males
  • Related to remodeling of bone following stress across the sacroiliac joint
    • Other theories of etiology are that it is related to a urinary tract infection, or that it
    • May be related to a form of inflammatory arthritis

 

MORE . . .

 


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