case_images: PMC10864135_01
case_images: Preoperative MRI images. MRI of the brain showing a left frontal lesion on T2-weighted axial and coronal images (A and B), and fluid-attenuated inversion recovery images (C). Enhanced MRI showing a linear contrast effect in the posterior part of the lesion (D: yellow arrow).
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case_images: F1
case_images: Contrast-enhanced MRI showed a linear contrast effect in the posterior part of the lesion (Fig. 1).
case_images: Intraoperative images. A: Intraoperative photograph of the surface of the exposed operative field. The tumor boundaries identified using ultrasonography and neuro-navigation are marked by alphabets (A-E). The eloquent cortical sites identified using electrical stimulations are marked by numbers as follows: 1: primary motor cortex of the face, and 2: phonemic paraphasia. B: Intraoperative photograph after resection. The eloquent sites of the white matter identified using electrical stimulations are marked by numbers as follows: 47-49: facial dysfunction (pyramidal tract).
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case_images: F2
case_images: No other speech disturbances were induced by cortical stimulation on the surface of the tumor (tumor boundary: A-E) (Fig. 2A). Second, we carefully resected the tumor with cavitron ultrasonic surgical aspirator, and cessation of counting was reproducibly elicited at the superior part of the tumor cavity by subcortical stimulation (Fig. 2B).
case_images: Postoperative MRI images. T2-weighted axial (A) and coronal (B) images obtained the day after surgery showed gross total removal.
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case_images: F3
case_images: A postoperative MRI assessment was performed the day after surgery to evaluate the extent of resection, which revealed gross total resection of the lesion (Fig. 3).
case_images: Histopathological images. Histopathological examination showed that tumor cells were oriented around the capillaries (A and B: hematoxylin-eosin staining, x200). These cells were positive for glial fibrillary acidic protein (x200) (C), while the Ki-67 immunolabelling index (x200) value was 2.4% (D).
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case_images: F4
case_images: The Ki-67 immunolabelling index value was 2.4% (Fig. 4).