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AJNR - American Journal of Neuroradiology

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Pallidoreticular Damage in Acute Carbon Monoxide Poisoning: Diffusion-Weighted MR Imaging Findings

Toshibumi Kinoshita^a, Shuji Sugihara^a, Eiji Matsusue^a, Shinya Fujii^a, Motoki Ametani^a and Toshihide Ogawa^a

^a From the Division of Radiology, Department of Pathophysiological and Therapeutic Science, Faculty of Medicine, Tottori University, Tottori, Japan

View larger version (68K): [in a new window]   FIG 1. T2-weighted image obtained 5 days after exposure to carbon monoxide (A) shows symmetrical high-signal-intensity lesions in the bilateral globi pallidi. Diffusion-weighted image (B) reveals symmetrical high-signal-intensity lesions in the globi pallidi. Corresponding ADC map (C) demonstrates low-signal-intensity lesions with high-signal-intensity rims in the bilateral globi pallidi.

View larger version (112K): [in a new window]   FIG 2. T1-weighted image obtained 12 days after exposure to carbon monoxide (A) shows slightly high-signal-intensity lesions with relatively low-intensity rim in the bilateral globi pallidi. T2-weighted image (B) shows slightly low-signal-intensity lesions with high-signal-intensity rim in the bilateral globi pallidi. Coronal T2-weighted image (C) reveals high-signal-intensity lesions in the bilateral substantia nigra, in addition to high-signal-intensity pallidal lesions. Diffusion-weighted image (D) reveals high-signal-intensity lesions in the pars reticulata of the bilateral substantia nigra. Corresponding ADC map (E) demonstrates low signal intensity in the bilateral substantia nigra.

View larger version (139K): [in a new window]   FIG 3. T1-weighted image obtained 2 months after exposure to carbon monoxide (A) shows slightly high-signal-intensity lesions in the bilateral substantia nigra. T2-weighted image (B) shows confluent high-signal-intensity lesions in the bilateral periventricular deep white matter. Diffusion-weighted image (C) reveals diffuse high-signal-intensity lesions in the bilateral periventricular deep white matter. Corresponding ADC map (D) demonstrates low-signal-intensity in the bilateral periventricular deep white matter.