Article Figures & Data
Figures
- FIG 1.
Multiple axial images show 2 intradural extramedullary lesions (solid arrows) at the foramen magnum posterior to the vertebral arteries, superior to their dural insertion. The lesions demonstrate hyperintense signal on T2-weighted FLAIR imaging (A), are isointense to CSF on T2-weighted imaging (B), and are avidly enhancing (C). FIESTA imaging (D) shows contact with the spinal accessory nerve (broken arrows).
- FIG 2.
Intraoperative photograph demonstrates the lesion with a superficial yellow membrane over an apparent cyst with a more solid and firm component deep to that. The lesion was adherent to a lower cranial nerve, identified as the left SAN on intraoperative nerve monitoring.
- FIG 3.
H&E sections of the resected specimen illustrate the densely fibrotic nodule (A), involving the arachnoid (B). Small nests of meningothelial cap cells with focal psammoma body formation are present (C), adjacent to the nodule.
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