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Figure 1: (a) Axial fl uid-attenuated inversion recovery and coronal T2-weighted magnetic resonance imaging images showing a well-defined extra-axial mass in the left cerebellopontine angle cistern with a broad dural base causing mass eff ect on underlying cerebellum and brainstem with resultant compression and displacement of the fourth ventricle causing upstream obstructive hydrocephalus. Heterogeneous signal intensity with areas of necrosis/cystic degeneration and mild perifocal edema is also seen. (b) T1-weighted coronal and sagittal magnetic resonance imaging images with contrast showing moderate heterogeneous enhancement with small, nonenhancing areas within along with mass eff ect on the pons and middle cerebellar peduncle with tonsillar herniation. (c) Diff usionweighted images showing restricted diff usion

Figure 1: (a) Axial fl uid-attenuated inversion recovery and coronal T2-weighted magnetic resonance imaging images showing a well-defined extra-axial mass in the left cerebellopontine angle cistern with a broad dural base causing mass eff ect on underlying cerebellum and brainstem with resultant compression and displacement of the fourth ventricle causing upstream obstructive hydrocephalus. Heterogeneous signal intensity with areas of necrosis/cystic degeneration and mild perifocal edema is also seen. (b) T1-weighted coronal and sagittal magnetic resonance imaging images with contrast showing moderate heterogeneous enhancement with small, nonenhancing areas within along with mass eff ect on the pons and middle cerebellar peduncle with tonsillar herniation. (c) Diff usionweighted images showing restricted diff usion