MRI and Diffusion MRI in nonparaneoplastic limbic encephalitis
This paper reports an 65-year-old woman with nonparaneoplastic limbic encephalitis. On MRI and diffusion MRI, diffuse and symmetrical, bilateral high-signal lesions were evident in the medial temporal lobes. The affected areas were hyperintense on b=1000s/mm2 (heavily diffusion-weighted or true diffusion) images, a pattern similar to cytotoxic edema. However, apparent diffusion coefficient (ADC) values read directly from corresponding ADC maps at each temporal lobe were within normal limits: 0.96 and 0.9710?3mm2/s, respectively, excluding cytotoxic edema. The changes were shown to be resolved on a 9-month follow-up MRI.
limbic encephalitis diffusion-weighted mri