36 year old gentleman with history of left hip pain since 3 weeks

36 year old gentleman with history of left hip pain since 3 weeks

  • 36 year old gentleman with history of left hip pain since 3 weeks.
  • On examination reduced ROM at hip joint and tenderness over gluteal area.

IMAGE A: Sagittal and axial STIR images show marrow edema at posterior wall of left acetabulum with traces of periosteal edema/fluid along posterior margin of acetabulum.

IMAGE B: CT demonstrates small bone fragment abutting the posterior lip of left acetabulum in hip joint space with a tiny adjacent lytic area.

Inta-articular osteoid osteoma


  • Osteoid osteomas are benign bone forming tumors that tend to occur in patients between the ages of 10 and 30 years.?
  • Osteoid osteomas have been categorized by location as subperiosteal, cortical, and cancellous. ?
  • Clinical presentation is with nocturnal pain, relieved by NSIADs.
  • Intra-articular present with atypical symptoms of inflammatory arthropathy or synovitis.
  • The classic radiographic appearance of the more common cortical osteoid osteoma is that of a radiolucent nidus, with or without internal calcification and with surrounding sclerosis and cortical thickening.
  • Intraarticular osteoid osteoma, which occurs within or near a joint, is considered a separate clinical entity.?
  • The most commonly involved joint is the hip.?
  • Radiological features: reactive cortical thickening and sclerosis, periosteal reaction are minimal or absent, a finding believed to be due to a lack of cambium, the inner layer of the periosteum.
  • Nidus is often overlooked on imaging.
  • MRI: detect soft tissue and marrow abnormalities that CT cannot detect.


  1. Ebrahim FS, Jacobson JA, Lin J, Housner JA, Hayes CW, Resnick D. Intraarticular osteoid osteoma: sonographic findings in three patients with radiographic, CT, and MR imaging correlation. AJR Am J Roentgenol. 2001 Dec;177(6):1391-5. doi: 10.2214/ajr.177.6.1771391. PMID: 11717092.
  2.  Jee Won Chai, Sung Hwan Hong, Ja-Young Choi, Young Hwan Koh, Joon Woo Lee, Jung-Ah Choi, and Heung Sik Kang. Radiologic Diagnosis of Osteoid Osteoma: From Simple to Challenging Findings. RadioGraphics 2010 30:3, 737-749

Dr. Ashwini C,
Consultant Radiology,
Manipal Hospitals Radiology Group.

Dr Vikas H P
DNB resident
Manipal Hospitals Radiology Group.