PMC7193197_01
Initial brain magnetic resonance imaging showing right- sided extra-axial high parietal parasagittal mass in (a) transverse plain, T1-weighted image; (b) sagittal plain, T1-weighted image; and (c) coronal plain, T1-weighted image. Note the marginal heterogeneous enhancement of the tumor after the administration of intravenous contrast.
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F1
After the administration of intravenous contrast, the solid mass showed heterogeneous enhancement [Figure 1].
Microphotography of a pathohistological section showing histological and immunohistochemical features of a pilocytic astrocytoma stained with (a) IDH-1, original magnification of x200, showing the absence of IDH mutation, (b) hematoxylin and eosin, original magnification of x400, showing characteristic Rosenthal fibers and eosinophilic granular bodies, (c) strong positive reaction for glial fibrillary acidic protein staining, original magnification of x100, (d) proliferation index Ki67, original magnification of x200, showing up to 3% diffusely and up to 10% focally.
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F2
Proliferation index Ki67 was up to 3% diffusely and up to 10% focally [Figure 2].
Microphotography of a pathohistological section showing histological and immunohistochemical features of a pineocytoma stained with (a) hematoxylin and eosin, original magnification of x100, showing moderate cellularity, (b) hematoxylin and eosin, original magnification of x200, showing pineocytomas rosette formation, (c) strong positive reaction for synaptophysin immunohistochemistry staining, original magnification of x200.
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F3
The proliferation index Ki67 was around 1% [Figure 3].
Brain magnetic resonance imaging scans, 5 months postoperatively, (a) transverse plain, T1-weighted image; (b) sagittal plain, T1-weighted image; (c) coronal plain, T2-weighted image. Note how there is no recurrence or additional intracranial mass in the images.
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F4
MRI revealed a satisfying postoperative result without the recurrence of intracranial masses [Figure 4].