Fig. 3.

Radiological and histopathological features of case #8. Axial T2-weighted image showing a circumscribed hemorrhagic lesion of the right cerebellopontine angle (a), with a low signal on T1-weighted images (b), and a peripheral enhancement on T1-weighted image with gadolinium injection (c). Ependymal features with pseudorosettes (d HPS, magnification 400$\times$), associated with no immunoreactivity for Olig2 (e magnification 400$\times$). Neurofilament immunostaining confirming the solid pattern (f magnification 400$\times$). Immunoexpression of H3K27M in all tumor cells (g magnification 400$\times$). Scale bars represent 50 µm. HPS: Hematoxylin Phloxin Saffron