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Evaluation of Carotid Stenosis by Using Carotid Ultrasonography Nahoko Seike 1 , Michiko Ito 1 , Masahiro Yasaka 2 1Medical Laboratory,National Hospital Organization Kyushu Medical Center 2Department of Cerebrovascular Medicine,Cerebrovascular Center,National Organization Kyushu Medical Center Keyword: champagne bottle neck sign , plaque intensity , NASCET , macaroni sign , carotid ultrasonography pp.1277-1284
Published Date 2010/12/1
DOI https://doi.org/10.11477/mf.1416100795

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Abstract

 Carotid stenosis is observed in several diseases such as atherosclerosis,moyamoya disease,and aortitis. Carotid stenosis can be assessed using computed tomography (CT),magnetic resonance angiography (MRA),ultrasonography,or cerebral angiography. Carotid ultrasonography is superior to other modalities because it is a noninvasive,repeatable,and easy method that does not involve much cost. The intima-media complex thickness (IMT) can be easily measured using carotid ultrasonography. The incidence of cerebral and cardiovascular events increases with increase in the thickness of the IMT. The percentage of stenosis was expressed using the NASCET,ECST,or area methods. The NASCET criterion of 70% stenosis for performing carotid endarterectomy for symptomatic carotid stenosis corresponded to 85% ECST stenosis,90% area stenosis,and 200 cm/sec of peak systolic velocity. Carotid ultrasonography provides information on not only carotid stenosis but also unstable plaques such as ulcer,hypoechoic plaque,thin fibrous cap,and mobile plaque. In patients with moyamoya disease,carotid ultrasonography often reveals that the diameter of the internal carotid artery (ICA) is greatly reduced at the proximal portion above the bulbus (resembling a champagne bottle neck) and is less than 50% that of the common carotid artery (champagne bottle neck sign); the diameter of the ICA is smaller than that of the external carotid artery (diameter reversal sign). In patients with aortitis,IMT thickness is frequently observed at the common carotid artery (Macaroni sign) but not at the ICA.


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電子版ISSN 1344-8129 印刷版ISSN 1881-6096 医学書院

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