Figure legend
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)