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Figure 1
Magnetic resonance imaging (T1 axial and saggital) shows diffuse altered signal intensity area involving the pons with its asymetrical expansion predominantly on the left aspect measuring 29 x 32 x 39 mm. The lesion is causing dorsal displacement of floor of the fourth ventricle with compression of the middle cerebeller peduncle more on the left side, and is abutting the basilar artery and its anterior displacement with normal flow voids.
Figure 2
Magnetic resonance imaging contrast (T1 axial and coronal) shows thick irregular and heterogeneous enhancement with in the expanded pons.
Figure 3
Histopathological examination showing increased cellularity and the cells are arranged in diffuse pattern in a fibrillary background. The cells are moderate to markedly pleomorphic and hyperchromatic with abundant eosinophilic cytoplasm. The nuclei are round, oval and elongated. Microvascular proliferation, few gemistocytes, necrosis in a tiny focal area and hemorrhage are also seen. (Magnification 10 X)