Isolated
cortical blindness without simultaneous neurological involvement in progressive multifocal leukoencephalopathy in a patient with human immune deficiency virus infection. Axial T2-Flair MRI and axial T2-Flair diffuse-weighted image. (a) Axial T2-Flair MRI of the brain showing hyperintense signal intensity lesions bilaterally in the parieto-occipital white matter. (b) Axial T2-Flair diffuse-weighted image showing hyperintense lesions bilaterally in the parieto-occipital white matter.