EURORAD ESR

Case 607

Schwannoma of the infratemporal fossa

Author(s)
El Khoury M., Abella-Franchi S., de Bazelaire C, Gaucher S, Sigal R
 
Patient
male, 30 year(s)
 
 
  • Figure 1
    CT views
     

    On this unenhanced CT, the mass cannot be separated from adjacent tissues and is only suspected because of the osseous deformation of the posterior wall of the maxillary sinus (with no resorption), of the left...

     
    Area of Interest: unknown; Imaging Technique: CT views;

    At an inferior level, there is a mass effect on the maxilla

     
    Area of Interest: unknown; Imaging Technique: CT views;
     
     
  • Figure 2
    T1 weighted MR views

    The tumor is seen as an homogenous mass with isosignal intensity relative to the muscles. The fatty tissues which is still visible on the contralateral side is not seen. The deformation of the postero-lateral border...

     
    Area of Interest: unknown; Imaging Technique: T1 weighted MR views;
     
     
  • Figure 3
    T2 weighted MR views
     

    On the axial view (same level as Fig 2a), the tumor is displayed with high signal intensity, compared to surrounding muscles. Note central necrotic components presenting as higher signal intensity.

     
    Area of Interest: unknown; Imaging Technique: T2 weighted MR views;

    An axial view obtained 2 cm below fig 3a shows the mass effect on the maxilla and masseter muscle laterally and pterygoid muscles medially.

     
    Area of Interest: unknown; Imaging Technique: T2 weighted MR views;

    The coronal view shows the mass effect on the orbit.

     
    Area of Interest: unknown; Imaging Technique: T2 weighted MR views;
     
     
  • Figure 4
    Gd enhanced T1 weighted MR views
     

    On the axial view (same level as Fig 2a and 3a), the tumor strongly enhances after gadolinium injection.

     
    Area of Interest: unknown; Imaging Technique: Gd enhanced T1 weighted MR views;

    The axial view obtained 2 cm below fig 4a (same level as Fig 3b) shows a central, hypointense, necrotic portion of the lesion.

     
    Area of Interest: unknown; Imaging Technique: Gd enhanced T1 weighted MR views;

    The same necrotic portion is seen on the coronal planer (same level as Fig 3c).

     
    Area of Interest: unknown; Imaging Technique: Gd enhanced T1 weighted MR views;

    The sagittal view shows the mass effect on the middle cranial fossa, without intracranial and intracerebral extension.

     
    Area of Interest: unknown; Imaging Technique: Gd enhanced T1 weighted MR views;
     
     
On this unenhanced CT, the mass cannot be separated from adjacent tissues and is only suspected because of the osseous deformation of the posterior wall of the maxillary sinus (with no resorption), of the left mandibular condyle (due to its slow-growing characteristic). There is no deformity of the left nasopharyngeal wall.
 
At an inferior level, there is a mass effect on the maxilla
 
The tumor is seen as an homogenous mass with isosignal intensity relative to the muscles. The fatty tissues which is still visible on the contralateral side is not seen. The deformation of the postero-lateral border of the maxillary sinus is also depicted (arrow).
 
On the axial view (same level as Fig 2a), the tumor is displayed with high signal intensity, compared to surrounding muscles. Note central necrotic components presenting as higher signal intensity.
 
An axial view obtained 2 cm below fig 3a shows the mass effect on the maxilla and masseter muscle laterally and pterygoid muscles medially.
 
The coronal view shows the mass effect on the orbit.
 
On the axial view (same level as Fig 2a and 3a), the tumor strongly enhances after gadolinium injection.
 
The axial view obtained 2 cm below fig 4a (same level as Fig 3b) shows a central, hypointense, necrotic portion of the lesion.
 
The same necrotic portion is seen on the coronal planer (same level as Fig 3c).
 
The sagittal view shows the mass effect on the middle cranial fossa, without intracranial and intracerebral extension.
 
 
 
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