@rb4hu - As far as I know an abnormal Doppler ultrasound should be confirmed with a CTA. Since my surgery and stent placement I had follow ups with CTA. However, at my last visit I was told that I can have ultrasound exams. It also depends on the institution doing the test. It is always good to get a second opinion. You would then bring the report on the Doppler and the CTA images. It is possible a vascular surgeon or GI surgeon would have more experience evaluating your brother. If possible, go to a major university medical center. I hope he will get relief soon. I know that pain.