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

Figure 1

Patient 1: noncontrast brain CT-scan showing occipital bilateral hyperdense nodules, predominantly on the right side, surrounded by edema, corresponding to brain hematomas (a). Noncontrast brain CT-scan 18 days later showing regression of the size and number of hematomas with a decrease in the degree of the surrounding edema (b). MRI-scan 6 weeks later, axial Fluid Attenuated Inversion Recovery, FLAIR (c), and Gradient Echo, GRE (d), weighted sequences showing a marked susceptibility effect confirming the haemorrhagic lesions and the presence of surrounding edema. Follow-up MRI-scan 4 months later with same sequences, showing regression of the size and number of hematomas with increase in the size of the vasogenic edema in the left occipital lobe (e and f).

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