CT and MRI diagnosis of posterior reversible encephalopathy syndrome
HAN Shun-chang1, ZHANG Hui1, GUO Yang1, LIU Xing-jun2
1. Department of Neurology, the Second Affiliated Hospital of China Medical University, Shenyang 110004, China; 2. Xilutian Department of Mineral General Hospital of Fushun, Fushun Liaoning 113001, China
Abstract：Objective: To study the CT and MRI features of posterior reversible encephalopathy syndrome(PRES) and assess their value. Method: The clinical and imaging data of 8 patients were analyzed retrospectively, 7 patients accepted routine CT examination, 8 patients accepted routine MRI examination, 5 had DWI and among them 3 accepted contrast enhanced scan. Results: The positive ratio of CT was 57% and MRI was 100%. The occipital lobe was involved in 8 cases, cerebella in 3 cases, brain stem in 2 cases, fronto-parietal subcortical white matter in 2 cases, caudate nucleus in 2 cases and thalamus in 1 case. The lesion showed gyrus-like abnormal signals in lobes and patchy abnormal signals in the other areas. The lesion showed low or iso signal on T1WI and high signal on T2WI and FLAIR. Contrast enhanced scanning showed no enhancement effect in 2 cases and gyrus, patchy and ring-like enhancement in another. The lesions demonstrated mild high signal in 1 case, high signal in 1 case, low signal in 1 case and no signal changes in 2 cases on DWI. Conclusion: The imaging findings of PRES are typical, so MRI should be the first choice in its diagnosis.
2007, Vol. 18 
