EURORAD ESR

Case 16175

Synovial osteochondromatosis inside a Baker's cyst

Author(s)
Pedro Gil Oliveira, Cristina Ferreira, Manuel Cruz, Cristina Marques, José Ilharco

Centro Hospitalar e Universitário de Coimbra; Praceta Mota Pinto 3000-075 Coimbra, Portugal; Email:pedro.gb.oliveira@gmail.com
 
Patient
male, 77 year(s)
 
 
  • Figure 1
    Plain radiographs of the knee (anteroposterior and lateral views)
     

    Anteroposterior radiograph showing a large mineralized mass behind the knee, with typical ring-and-arc appearance of chondroid tissue. There are signs of osteoarthritis.

     
    Area of Interest: Musculoskeletal joint; Musculoskeletal soft tissue; Imaging Technique: Conventional radiography; Plain radiographic studies; Procedure: Diagnostic procedure; Special Focus: Calcifications / Calculi;

    Lateral radiograph showing a large mineralized mass behind the knee, with typical ring-and-arc appearance of chondroid tissue, associated with some round bodies with peripheral rim cortex of calcification (target...

     
    Area of Interest: Musculoskeletal joint; Musculoskeletal soft tissue; Imaging Technique: Conventional radiography; Plain radiographic studies; Procedure: Diagnostic procedure; Special Focus: Calcifications / Calculi;

    Lateral radiograph (digital magnification) showing the round bodies with peripheral rim cortex of calcification (target appearance).

     
    Area of Interest: Musculoskeletal joint; Musculoskeletal soft tissue; Imaging Technique: Conventional radiography; Plain radiographic studies; Procedure: Diagnostic procedure; Special Focus: Calcifications / Calculi;
     
     
  • Figure 2
    Magnetic resonance imaging of the knee

    Axial T2FS weighted image showing a Baker's cyst located between the medial head of the gastrocnemius and semimembranosus tendons. There are many bodies inside the cyst with low signal intensity due to calcification.

     
    Area of Interest: Musculoskeletal joint; Musculoskeletal soft tissue; Imaging Technique: MR; Procedure: Diagnostic procedure; Special Focus: Calcifications / Calculi;
     
     
  • Figure 3
    Magnetic resonance imaging of the knee
     

    Sagittal PD weighted image shows the Baker's cyst containing bodies with low signal intensity due to calcification and others with central fat intensity (similar to fatty marrow) and low signal intensity rim due to...

     
    Area of Interest: Musculoskeletal joint; Musculoskeletal soft tissue; Imaging Technique: MR; Procedure: Diagnostic procedure; Special Focus: Calcifications / Calculi;

    Sagittal T2 FS weighted image shows the Baker's cyst containing many bodies with low signal intensity due to calcification and others bodies with homogeneous hyposignal by saturation of fat content similar to fatty...

     
    Area of Interest: Musculoskeletal joint; Musculoskeletal soft tissue; Imaging Technique: MR; Procedure: Diagnostic procedure; Special Focus: Calcifications / Calculi;

    Sagittal PD weighted image showing bodies of low signal intensity due to calcification adjacent to the posterior cruciate ligament and along the popliteal tendon sheath.

     
    Area of Interest: Musculoskeletal joint; Musculoskeletal soft tissue; Imaging Technique: MR; Procedure: Diagnostic procedure; Special Focus: Calcifications / Calculi;
     
     
  • Figure 4
    Magnetic resonance imaging of the knee
     

    Axial T1 weighted image shows a body inside the Baker's cyst, which reveals central fat intensity similar to fatty marrow.

     
    Area of Interest: Musculoskeletal joint; Musculoskeletal soft tissue; Imaging Technique: MR; Procedure: Diagnostic procedure; Special Focus: Calcifications / Calculi;

    Axial T1 FS weighted image shows the same body inside the Baker's cyst, which reveals homogeneous saturation of fat content similar to fatty marrow.

     
    Area of Interest: Musculoskeletal joint; Musculoskeletal soft tissue; Imaging Technique: MR; Procedure: Diagnostic procedure; Special Focus: Calcifications / Calculi;
     
     
Anteroposterior radiograph showing a large mineralized mass behind the knee, with typical ring-and-arc appearance of chondroid tissue. There are signs of osteoarthritis.
 
Lateral radiograph showing a large mineralized mass behind the knee, with typical ring-and-arc appearance of chondroid tissue, associated with some round bodies with peripheral rim cortex of calcification (target appearance). There are signs of osteoarthritis.
 
Lateral radiograph (digital magnification) showing the round bodies with peripheral rim cortex of calcification (target appearance).
 
Axial T2FS weighted image showing a Baker's cyst located between the medial head of the gastrocnemius and semimembranosus tendons. There are many bodies inside the cyst with low signal intensity due to calcification.
 
Sagittal PD weighted image shows the Baker's cyst containing bodies with low signal intensity due to calcification and others with central fat intensity (similar to fatty marrow) and low signal intensity rim due to ossification.
 
Sagittal T2 FS weighted image shows the Baker's cyst containing many bodies with low signal intensity due to calcification and others bodies with homogeneous hyposignal by saturation of fat content similar to fatty marrow.
 
Sagittal PD weighted image showing bodies of low signal intensity due to calcification adjacent to the posterior cruciate ligament and along the popliteal tendon sheath.
 
Axial T1 weighted image shows a body inside the Baker's cyst, which reveals central fat intensity similar to fatty marrow.
 
Axial T1 FS weighted image shows the same body inside the Baker's cyst, which reveals homogeneous saturation of fat content similar to fatty marrow.
 
 
 
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