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. 2012 Sep;85(1017):e782–e792. doi: 10.1259/bjr/30039090

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© 2012 The British Institute of Radiology

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A 61-year-old female with hyperammonemic encephalopathy. Axial fluid-attenuated inversion-recovery images show (a) bilateral peripheral cortical temporal lobe (white arrows) and (b) right posterior cingulate gyrus (open arrow) hyperintensity. Diffusion-weighted images show corresponding restricted diffusion (white arrows) in (c) the bilateral peripheral cortical temporal lobe and (d) the right posterior cingulate gyrus. The typical distribution of lesions with elevated blood ammonia level suggests this diagnosis.