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FIG 5. Patient 13: 5-year-old boy with right hemiparesis. This case illustrates overestimation of ICA stenosis by MR angiography as compared with DSA.
A, T2-weighted MR image shows infarct in left putamen (arrows).
B, Coronal MIP from 3D TOF MR angiography shows narrowed left ICA (straight arrow). Apparent narrowing of left MCA (curved arrow) is a reconstruction artifact that was not present on the axial source or multiplanar reformatted images.
C, Selective left ICA injection done 17 hours after MR angiography shows apparent concentric narrowing (possibly spasm) of the supraclinoid ICA. The MCA was normal.
D, Lateral view of the right ICA is shown for comparison. Note the caliber of the supraclinoid ICA.
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