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Fig. 9B. —51-year-old male smoker. This case is example of underestimation of stenosis using MR angiography and points to semantic difficulties associated with classification of vascular morphology and can be regarded as example of interobserver variability rather than failure of MR angiography to accurately estimate vascular disease. Conventional angiogram shows same lesion (arrow) as that in A. Lesion was characterized as severe.