PMC3644789_01
Diffusion-weighted MRI showed diffusion restriction with high signal intensity (HI) of the right parietal cortex on ADC map (arrows), suggesting vasogenic edema (a-d). Dilatation of cortical veins and superior sagittal sinus on gradient echo images (arrows) (e, f). T2- and FLAIR MRI showed HI over the left frontal and right parietal cortex (arrows) (g, h). Gadolinium-enhanced T1-weighted MRI showed the "empty delta sign" (arrows) (i, j). MRV revealed the absence of the superior sagittal sinus, straight sinus, and right transverse sinus, indicating cerebral venous thrombosis (k, l)
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F1
The b-value of 1000 s/mm2 and apparent diffusion coefficient (ADC) image of the DWI showed high signal intensity in the right parietal cortex, suggesting vasogenic edema [Figure 1a-b]. Gradient-echo imaging (GRE) identified superior sagittal sinus (SSS) and cortical vein dilatation [Figure 1e and f]. T2-weighted and fluid-attenuated inversion recovery images, with an empty delta sign on gadolinium-enhanced T1-weighted images [Figure 1g-j]. There was no evidence to suggest SIH on MRI, such as pachymeningeal enhancement or downward brain displacement. Brain MR venography (MRV) revealed the absence of the SSS, straight sinus and right transverse sinus [Figure 1k and l].
PMC3644789_02