EURORAD ESR

Case 1808

Aneurysmal bone cyst of the temporal bone

Author(s)
Cakirer S, M. Basak M*, F. Kabukcuoglu F**
 
Patient
male, 52 year(s)
 
 
  • Figure 1
    MRI pictures
     

    Axial fast spin-echo T2-weighted MR image (repetition time msec/echo time msec, 3200/112) shows a well-circumscribed left-sided multi-cystic temporal lesion with a peripheral hypointense capsule and internal...

     
    Area of Interest: unknown; Imaging Technique: MRI pictures;

    Coronal FLAIR MR image (repetition time msec/echo time msec/inversion time msec, 6000/95/1800) reveals the intracranial extension of the lesion, causing a prominent compression on the neighboring temporal lobe, and...

     
    Area of Interest: unknown; Imaging Technique: MRI pictures;

    Axial post-gadolinium spin-echo T1-weighted MR image (repetition time msec/echo time msec, 430/15) shows intense contrast enhancement of the left temporal lesion at its periphery and internal septations. Dural layer...

     
    Area of Interest: unknown; Imaging Technique: MRI pictures;
     
     
  • Figure 2
    Histological pictures
     

    Microphotograph of the surgical specimen shows cystic spaces containing red blood cells, which are separated by septa composed of spindle-shaped fibroblastic cells and some scattered multinucleated giant cells...

     
    Area of Interest: unknown; Imaging Technique: Histological pictures;

    The septum contains areas of reactive osteoid formation with some scattered multinucleated giant cells, and cystic spaces containing plenty of red blood cells (Hematoxylin-eosin stain; original magnification, x200).

     
    Area of Interest: unknown; Imaging Technique: Histological pictures;
     
     
Axial fast spin-echo T2-weighted MR image (repetition time msec/echo time msec, 3200/112) shows a well-circumscribed left-sided multi-cystic temporal lesion with a peripheral hypointense capsule and internal hypointense septations. The cystic mass causes expansion of the diploic space of the temporal bone with thinning of external and internal tables. The cavities are filled with hyperintense fluid.
 
Coronal FLAIR MR image (repetition time msec/echo time msec/inversion time msec, 6000/95/1800) reveals the intracranial extension of the lesion, causing a prominent compression on the neighboring temporal lobe, and indirectly on the frontobasal lobe and left cerebral peduncle. The mass causes effacement of the left sylvian cistern and left sided lateral ventricle compartments, and an additional contralateral subfalcian shift of the midline structures.
 
Axial post-gadolinium spin-echo T1-weighted MR image (repetition time msec/echo time msec, 430/15) shows intense contrast enhancement of the left temporal lesion at its periphery and internal septations. Dural layer and peripheral capsule of the lesion on the cranial side are not clearly differentiated from each other. The mass shows some degree of extracranial extension associated with the edema of overlying temporalis muscle and scalp as well.
 
Microphotograph of the surgical specimen shows cystic spaces containing red blood cells, which are separated by septa composed of spindle-shaped fibroblastic cells and some scattered multinucleated giant cells (Hematoxylin-eosin stain; original magnification, x100).
 
The septum contains areas of reactive osteoid formation with some scattered multinucleated giant cells, and cystic spaces containing plenty of red blood cells (Hematoxylin-eosin stain; original magnification, x200).
 
 
 
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