FIG 7. Axial MR images obtained in a 65-year-old man with aphasia that rapidly resolved within 3 hours of onset.

A, A diffusion-weighted image obtained 2 days after symptom onset clearly depicts a small, acute cortical ischemic lesion in the opercula of the left frontal lobe.

B, A follow-up fast-FLAIR MR image obtained 3 months later shows a small cortical lesion with high signal intensity at the same location as the lesion in A, indicating a chronic infarct. This subsequent infarct might have been overlooked had the reader not been aware of the location of the lesion on the initial diffusion-weighted image.