PMC5958410_01
Brain MRI. Axial T2w (a,b) ADC map (c) and Gd T1w (d) images. Extensive hyperintense mass in the left cerebellopontine angle extended upward into the cerebellum with lower peripheral ADC values and subtle peripheral linear irregular enhancement after gadolinium injection. The fourth ventricle, medulla oblongata and the cerebellum are dislocated and compressed.
fped-06-00108-g0001.jpg
PMC5958410_01_fped-06-00108-g0001.jpg
F1
The fourth ventricle and the cerebellar vermis was dislocated (Figure 1).
(A) Hematoxylin&Eosin staining shows a diffused, monomorphic, round cell proliferation with various degrees of ganglioid differentiation. (B) Strong positivity for synaptophysin immunostain.
fped-06-00108-g0002.jpg
PMC5958410_01_fped-06-00108-g0002.jpg
F2
A diagnosis of extra-ventricular (ganglio)neurocytoma was then formulated and the tumor was classified as grade II according to WHO 2016, with a particular mention of the focal higher proliferation index (Figure 2).