case_images: PMC10565212_01
case_images: (A). Axial T2 (left) and sagittal 3D CUBE FLAIR (right) images from brain MRI approximately two months before surgery demonstrate an intraventricular mass with a bubbly appearance centered at the right aspect of the septum pellucidum, near the fornices. (B). Axial T2 image (left) and axial diffusion-weighted image (DWI) (right) one day post-surgery demonstrates swelling and restricted diffusion of the bilateral anterior fornices suggesting forniceal injury. The hyperintense signal on the axial DWI had corresponding hypointense signal on the apparent diffusion coefficient (ADC) map, not pictured here, confirming true restricted diffusion. (C). Axial T2 image approximately 4-months after surgery demonstrates irregular and mildly atrophic appearance of the fornices, compatible with evolution of previously seen cytotoxic edema in this region. (D). Axial T2 image approximately 10-months after surgery demonstrates progressive atrophic appearance of the fornices.
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case_images: A CT revealed an incidental brain mass, which led to referral for MRI that demonstrated a non-enhancing lesion measuring 2.2 cm centered at the right aspect of the septum pellucidum ( Figure 1A ), with associated mild obstructive hydrocephalus of the lateral ventricles. An MRI one-day post-surgery revealed swelling and restricted diffusion of the bilateral anterior fornices, compatible with cytotoxic edema and raising concern for forniceal injury ( Figure 1B ). An MRI four-months post-resection revealed irregular and mildly atrophic appearance of the fornices, compatible with evolution of the previously seen cytotoxic edema ( Figure 1C ). A repeat MRI 10-months post-resection showed progressive atrophy of the fornices ( Figure 1D ).
case_images: (A). Hematoxylin and eosin (H&E) stained squash preparation and (B). tissue section both show a dual cell population, with a predominance of uniform small round oligodendrocyte-like cells in a fibrillar background, focally accompanied by floating neurons (arrows), which appear larger, with more cytoplasm, and prominent nucleoli.
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case_images: PMC10565212_01_fonc-13-1263556-g002.jpg
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case_images: Histologic examination revealed a low-grade glioneuronal tumor with floating neurons in a faintly basophilic matrix surrounded by bland oligodendrocyte-like tumor cells ( Figure 2 ).
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case_images: PMC10565212_03