PMC7294174_01
Bone window (left), noncontrast (middle), and postcontrast (right) CT brain.
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F1
The lesion eroded the inner table of the left frontal bone with the outer table almost completely eroded [Figure 1].
T1 FLAIR pre- (left) and postgadolinium (middle) and T2 (right).
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F2
MRI brain with contrast demonstrated a large extra-axial ovoid heterogeneously enhancing left frontal convexity mass measuring 6.2 cm x7.1 cm x7 cm [Figure 2].
(a) Intraoperative photograph of the tumour breaching dura, (b) The tumour had extended through the skull.
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F3
Intraoperatively, the tumor was found to have breached the dura and as suggested by preoperative imaging, had invaded bone [Figure 3].
(a) Hematoxylin and eosin stain (high-power view), (b) hematoxylin and eosin stain (low-power view).
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F4
Under light microscopy, the specimen showed a durally based, highly cellular tumor composed of relatively monotonous small blue cells with slightly irregular nuclei and thin rims of cytoplasm [Figure 4] displaying PAS- positive material [Figure 5].
(a) PAS positive, (b) FLI-1 positive, (c) MIC-2 positive, (d) Ki67 30% positive by visual estimation.
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F5
Under light microscopy, the specimen showed a durally based, highly cellular tumor composed of relatively monotonous small blue cells with slightly irregular nuclei and thin rims of cytoplasm [Figure 4] displaying PAS- positive material [Figure 5]. The tumor cells were positive for FLI-1, MIC-2, and vimentin [Figure 5].