Fig 5. Subject (8-year-old) with an obstructive hydrocephalus secondary to infratentorial mass before (A, T1-weighted image; C, T2-weighted image) and after placement of a ventriculoperitoneal shunt (B, T1-weighted image; D, T2-weighted image). Notice the location and lining of the areas with increased signal intensity hypointensities on T1-weighted images in the periventricular white matter before drainage (A), disappearing after drainage (B).