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Fig. 4C. —77-year-old woman with late-onset hypertension. Conventional angiogram by selective injection depicts less narrowing at ostium than shown on MR angiogram. Dense calcifications were observed on unenhanced angiograms. On basis of angiographic findings, patient did not undergo interventional therapy. This patient had false-positive MR angiography finding, but true-negative velocity waveform analysis.