Differential Diagnosis: (cont.)

• Primary SI tumor

  • rare and usually synovial villoadenomas

• Iatrogenic instability

  • via pelvic tumor resection or bone graft site

• Osteitis condensans ilii

  • prevalence of 2.2 %
  • usually self-limiting and bilateral
  • primarily in multiparous women
  • increased bone density on inferior iliac side

• Referred pain

• Reactive disease as sequellae of PID

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