case_images: PMC9479645_01
case_images: Radiological examinations: (a) preoperative axial T1-weighted contrast-enhanced MRI demonstrating a rim-enhancing lesion. (b) Postoperative axial T1-weighted contrast-enhanced MRI showing the thin layer of tumor left at surgery.
case_images: SNI-13-338-g001.jpg
case_images: PMC9479645_01_SNI-13-338-g001.jpg
case_images: F1
case_images: The differential diagnosis at this time included cystic meningioma as first option or atypical schwannoma [Figure 1a]. A near-total resection was performed to preserve these structures [Figure 1b].
case_images: Histological examination: (a) (H&E, x40) Ancient schwannoma showing cystic change. (b) (H&E, x100) Hyalinized vessels surrounded by spindle cells and focal hemosiderin pigment. (c) (H&E, x400) Presence of Verocay bodies. (d) (S100, x40) Diffuse S100 positivity.
case_images: SNI-13-338-g002.jpg
case_images: PMC9479645_01_SNI-13-338-g002.jpg
case_images: F2
case_images: Final anatomopathological diagnosis was ancient schwannoma [Figure 2].
case_images: Thirteen-month follow-up axial T1-weighted contrast-enhanced MRI showing regrowth of the tumor.
case_images: SNI-13-338-g003.jpg
case_images: PMC9479645_01_SNI-13-338-g003.jpg
case_images: F3
case_images: Subsequent MRIs showed regrowth of the residual lesion 13 months after surgery [Figure 3], especially of its cystic component.