Grade II:  Atherosclerotic plaques are seen which appear to be causing 40-60% obstruction.,Grade III:  Atherosclerotic plaques are seen which appear to be causing greater than 60% obstruction.,Grade IV:  The vessel is not pulsating and the artery appears to be totally obstructed with no blood flow in it.,RIGHT CAROTID SYSTEM: , The common carotid artery and bulb area shows mild intimal thickening with no increase in velocity and no evidence for any obstructive disease.  The internal carotid artery shows intimal thickening with some mixed plaques, but no increase in velocity and no evidence for any significant obstructive disease.  The external carotid artery shows no disease.  The vertebral was present and was antegrade.,LEFT CAROTID SYSTEM: , The common carotid artery and bulb area shows mild intimal thickening, but no increase in velocity and no evidence for any significant obstructive disease. the internal carotid artery shows some intimal thickening with mixed plaques, but no increase in velocity and no evidence for any significant obstructive disease.  The external carotid artery shows no disease.  The vertebral was present and was antegrade.,IMPRESSION:,  Bilateral atherosclerotic changes with no evidence for any significant obstructive disease.radiology, atherosclerotic, atherosclerotic plaques, obstructive disease, carotid artery, carotid artery and bulb, common carotid artery, mild intimal thickening, external carotid artery, common carotid, internal carotid, external carotid, intimal thickening, carotid, intimal, plaques, artery,