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A, Axial T1 WI at the level of midbrain shows periaqueductal hypointensity (arrow). B, Post gadolinium T1 WI at the same level shows lack of enhancement of the periaqueductal lesion. C, The lesion appears hyperintense on T2WI (arrow). D and E, diffusion weighted image and ADC map respectively show increased diffusion in the lesion (arrow). F, The deep gray matter nuclei consisting of basal ganglia and thalami in this T2 weighted image show no abnormal signals

A, Axial T1 WI at the level of midbrain shows
periaqueductal hypointensity (arrow). B, Post gadolinium T1 WI at
the same level shows lack of enhancement of the periaqueductal
lesion. C, The lesion appears hyperintense on T2WI (arrow). D and
E, diffusion weighted image and ADC map respectively show
increased diffusion in the lesion (arrow). F, The deep gray matter
nuclei consisting of basal ganglia and thalami in this T2 weighted
image show no abnormal signals