FIG 2. Case 2. MR images obtained in a 71- year-old man on day 41 after CO exposure.

A, FLAIR image (TR/TE/TI/NEX, 9000/110/2200/1) shows asymmetric distribution of the high-intensity lesions in the periventricular white matter and corpus callosum.

B, DWI (TR/TE/NEX, 6500/98/1; b = 1000 s/mm²) shows similar high signal intensity in the periventricular white matter and corpus callosum. The high intensity is more prominent in the right frontal lobe and on the right side of the genu of the corpus callosum than elsewhere.

C, ADC map shows a focal area of subtle low signal intensity in the right frontal lobe (arrow). Other white matter lesions appear isointense.