| CRANIAL REGION | Torcula |
| HISTOPATHOLOGY | Meningioma, meningothelial type, WHO grade 1 |
| PRIOR SURGICAL RESECTION | No |
| PERTINENT LABORATORY FINDINGS | N/A |
Case description
A 56-year-old male patient was evaluated for occipital headache and a recent episode of visual blackout. Neuroophthalmologic examination showed normal visual fields and ocular pressure in both eyes. Magnetic resonance imaging (MRI) showed a tentorial meningioma adjacent to the straight sinus, torcula, and left transverse sinus. The tumor was treated with Gamma Knife radiosurgery (GKRS) ( Figure 12.60.1 ).
| Radiosurgery Machine | Gamma Knife – Model C |
| Radiosurgery Dose (Gy) | 14, at the 50% isodose line |
| Number of Fractions | 1 |
Axial, coronal, and sagittal postcontrast T1-weighted images showing a 4.5-cc tentorial meningioma adjacent to the straight sinus, torcula, and left transverse sinus. Gamma Knife radiosurgery was performed as a primary treatment, where a dose of 14 Gy was prescribed to the 50% isodose line, with a maximum dose of 28 Gy in the center of the tumor. The volume of the tissue that received more than 12 Gy was 6.6 cc.
| Critical Structure | Dose Tolerance |
|---|---|
| Transverse sinus | Not known |
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