Two Unusual Aspects of Posterior Reversible Encephalopathy Syndrome Mimicking Primary and Secondary Brain Tumor Lesions

Figure 2

Patient 2: noncontrast brain CT-scan (a) showing a diffuse area of unilateral hypoattenuation in the right white matter in the parietooccipital lobes with a discrete mass effect on the occipital horn of the lateral ventricle, without contrast enhancement (b), in favour of a space occupying lesion of the brain. MRI-scan, axial FLAIR (c) and Diffusion Weighted Imaging, DWI (d), showing an area of FLAIR hyperintensity without diffusion restriction and without contrast enhancement with the same localization as on the CT-scan corresponding to a vasogenic cerebral edema. Follow-up MRI-scan one month later, axial FLAIR (e) and DWI (f), showing the disappearance of the parietooccipital hyperintense area corresponding to a vasogenic cerebral edema, confirming PRES.

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