PMC9902872_01
A 22-year-old woman with right LVES. (A) Axial T2WI scan showed an approximately 3.0 cm x 2.5 cm x 2.5 cm irregular cystic-solid lesion at the posterior horn of the right lateral ventricle, intimately related to the choroid plexus, with mild peritumoral edema. The solid components exhibited low signa on T2WI, and the cystic components presented hyperintense signals on T2WI. (B-D) Axial, sagittal and coronal contrast-enhanced T1WI showed heterogeneous and apparent enhancement of the solid part of the mass but no obvious enhancement in the cystic part.
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The mass was hypointense on T1-weighted images and iso-hyperintense on T2-weighted images ( Figures 1A-D ).
(A) Cells are regular, round or spindle shaped, with clear or eosinophilic cytoplasm (H&Ex40). (B) Diffuse expression of the S-100 protein with immunohistochemistry (x20).
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The lesion was proven to be a schwannoma by pathological analysis ( Figure 2A ). In terms of immunohistochemical staining, the tumor cells were positive for S-100 ( Figure 2B ), vimentin and Ki-67 (1%) and negative for glial fibrillary acidic protein (GFAP) and epithelial membrane antigen (EMA).
(A, B) Postoperative axial and coronal MRI showing that no parts of the right lateral ventricle lesion remained after resection by a temporal-occipital craniotomy.
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The postoperative axial and coronal MRI scan revealed that the lesion had been completely resected ( Figures 3A, B ).