EURORAD ESR

Case 2365

Myositis ossificans of the psoas muscle: MRI findings

Author(s)
Ganiyusufoglu AK, Onat L, Sirvanci M, Aydiner O
 
Patient
female, 31 year(s)
 
 
  • Figure 1
     

    An axial T1-weighted SE MR image showing the presence of a mass lesion with indistinct margins and minimal diplacement. The lesion is iso-hyperintense with the muscle.

     
    Area of Interest: unknown;

    An axial T2-weighted SE MR image showing the presence of an inhomogeneous, well-defined mass with a hypointense rim and central hyperintensity, and also the surrounding perilesional edema.

     
    Area of Interest: unknown;

    A coronal STIR sequence showing the presence of a well-demarcated hyperintense lesion with a hypointense rim. A marked, diffuse surrounding edema extending along the psoas muscle is also noted.

     
    Area of Interest: unknown;

    Coronal postcontrast T1-weighted SE MR images with fat-saturation showing a marked enhancement of the lesion and the surrounding edema.

     
    Area of Interest: unknown;
     
     
  • Figure 2

    An axial CT scan showing the presence of an ellipsoid mass with a peripheral ring of new bone formation surrounding a central nonossified region, reflecting zone phenomenon.

     
    Area of Interest: unknown;
     
     
  • Figure 3

    A coronal STIR sequence, obtained two months later, showing an almost complete disappearance of the perilesional edema.

     
    Area of Interest: unknown;
     
     
An axial T1-weighted SE MR image showing the presence of a mass lesion with indistinct margins and minimal diplacement. The lesion is iso-hyperintense with the muscle.
 
An axial T2-weighted SE MR image showing the presence of an inhomogeneous, well-defined mass with a hypointense rim and central hyperintensity, and also the surrounding perilesional edema.
 
A coronal STIR sequence showing the presence of a well-demarcated hyperintense lesion with a hypointense rim. A marked, diffuse surrounding edema extending along the psoas muscle is also noted.
 
Coronal postcontrast T1-weighted SE MR images with fat-saturation showing a marked enhancement of the lesion and the surrounding edema.
 
An axial CT scan showing the presence of an ellipsoid mass with a peripheral ring of new bone formation surrounding a central nonossified region, reflecting zone phenomenon.
 
A coronal STIR sequence, obtained two months later, showing an almost complete disappearance of the perilesional edema.
 
 
 
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