EURORAD ESR

Case 14960

Hip Intraarticular Osteoid Osteoma – A Great Mimicker

Author(s)
Almeida Costa, Nuno; Pereira, David.

Instituto Português de Oncologia do Porto de Francisco Gentil, IPO - Porto
Rua Dr. António Bernardino de Almeida 4200-072 Porto, Portugal.
Email: nunoada@hotmail.com

POVISA Hospital
Calle Salamanca, 5. 36211, Vigo, Pontevedra, Espana.
Email: dpereira@povisa.es
 
Patient
male, 36 year(s)
 
 
  • Figure 1
    Right acetabulum edema

    Coronal STIR MR image showing edema in the right acetabulum and iliac bone. There is slight increase of articular fluid duo to synovitis.

     
    Area of Interest: Musculoskeletal joint; Imaging Technique: MR; Procedure: Diagnostic procedure; Special Focus: Oedema;
     
     
  • Figure 2
    Apparent osteochondral lesion in the right acetabulum

    Axial T2 FS MR image showing an apparently osteochondral lesion in the right acetabulum (arrow), with a thin T2 hyperintense signal rim.

     
    Area of Interest: Musculoskeletal joint; Imaging Technique: MR; Procedure: Diagnostic procedure; Special Focus: Pathology;
     
     
  • Figure 3
    Central T1 hypointense focus - intraarticular osteoid osteoma?

    Axial T1 MR image at a lower level depicts a tiny round hypointense component in the centre of the lesion.

     
    Area of Interest: Musculoskeletal system; Imaging Technique: MR; Procedure: Diagnostic procedure; Special Focus: Pathology;
     
     
  • Figure 4
    Hipervascular nidus highly suggestive of osteoid osteoma

    Coronal post-gadolinium MR image reveals enhancement of the non mineralized nidus.

     
    Area of Interest: Musculoskeletal joint; Imaging Technique: MR-Angiography; Procedure: Diagnostic procedure; Special Focus: Pathology;
     
     
  • Figure 5
    Mineralized central nidus - intraarticular osteoid osteoma

    Axial CT image showing the typical mineralized central nidus better defined than MR images. There is slight adjacent bone sclerosis.

     
    Area of Interest: Musculoskeletal joint; Imaging Technique: CT; Procedure: Diagnostic procedure; Special Focus: Pathology;
     
     
Coronal STIR MR image showing edema in the right acetabulum and iliac bone. There is slight increase of articular fluid duo to synovitis.
 
Axial T2 FS MR image showing an apparently osteochondral lesion in the right acetabulum (arrow), with a thin T2 hyperintense signal rim.
 
Axial T1 MR image at a lower level depicts a tiny round hypointense component in the centre of the lesion.
 
Coronal post-gadolinium MR image reveals enhancement of the non mineralized nidus.
 
Axial CT image showing the typical mineralized central nidus better defined than MR images. There is slight adjacent bone sclerosis.
 
 
 
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