Fig. 1

First MRI at the admission. a Patchy areas hyperintense in T2-weighted images involving bilaterally white matter of the occipital lobes and watershed areas between ACA-ACM vascular territories (arrows) which show b high signal on ADC maps (arrows). c Decreased angle between straight sinus and vein of Galen (black arrow) and downward displacement of the brain (white arrow), “sagging” midbrain and enlargement of venous structures (curved arrow) and of pituitary gland. d No evidence of venous thrombosis on venous angiography. f No areas of constriction and dilatation on 3D TOF MRA MIP images of the Circle of Willis. e T1 post-contrast images show enhancing pachimeningeal thickening (arrows)