{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,26]],"date-time":"2026-03-26T14:10:33Z","timestamp":1774534233696,"version":"3.50.1"},"reference-count":12,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2002,6,26]],"date-time":"2002-06-26T00:00:00Z","timestamp":1025049600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J of Clinical Ultrasound"],"published-print":{"date-parts":[[2002,7]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>In a small percentage of cases with an occluded common carotid artery (CCA), the patency of the arteries beyond the carotid bulb is preserved. Color duplex sonography is useful for assessing blood flow in these vessels. We present a case of retrograde flow in an internal carotid artery (ICA) with an occluded ipsilateral CCA identified using color duplex sonography in a 70\u2010year\u2010old man with diabetes and known atherosclerotic disease. Color duplex sonography revealed that the right CCA was totally occluded near its origin and that flow was re\u2010established at the bulb. Flow in the right ICA was directed cephalad, with a low\u2010frequency, damped waveform; flow in the right external carotid artery (ECA) was bidirectional, with increased reversed diastolic flow. Extensive atherosclerotic lesions were also found in the left side. Endarterectomy of the left carotid bifurcation was performed. Follow\u2010up color duplex sonography 3 months later revealed a small increase of stenosis in the left CCA and mild stenosis in the left ICA. The right CCA remained occluded, but reversed flow with a high\u2010resistance flow pattern was seen in the ipsilateral ICA that supplied the ECA, which had cephalad\u2010directed flow. \u00a9 2002 Wiley Periodicals, Inc. J Clin Ultrasound 30:388\u2013391, 2002; Published online in Wiley InterScience (www.interscience.wiley.com). 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