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FIG 1. Case 1. MR images obtained in a 54-year-old woman on day 25 after CO exposure.
A and B, T2-weighted images (TR/TE/NEX, 4000/98/1) show bilateral, symmetric, confluent areas of high signal intensity in both the centrum semiovale (A) and periventricular white matter (B). The high intensity appears more prominent in the frontal lobes than elsewhere.
C and D, ADC maps (calculated from DWIs [6500/98/1, b = 0 and 1000 s/mm2]) obtained at the same levels as in A and B, respectively, show focal areas of low signal intensity (decreased diffusion) in the bilateral frontal lobes. Most of the remaining centrum semiovale and periventricular white matter appears isointense. DWIs at the same levels showed confluent high signal intensity in the centrum semiovale and periventricular white matter. The appearance was similar to that on the T2-weighted images (not shown) and mainly resulted from a T2 shine-through effect.
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