左右非対称性大脳動脈輪の1例

DOI
  • 隅田 寛
    Department of Clinical Radiology, Faculty of Health Sciences Hiroshima International University
  • 瀧村 洋子
    Department of Clinical Radiology, Faculty of Health Sciences Hiroshima International University

書誌事項

タイトル別名
  • A Case of Left-Right Asymmetrical Circle of Willis

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抄録

Though the circle of Willis has been usually described as the left-right symmetrical arterial circle in the anatomical text, various variations of the circle have been reported. It is important for comedical clinicians to have some knowledge concerning variations of the circle of Willis. For instance, clinical radiologists have to know the existence of variations to avoid misreading of the cerebral arterial angiogram. In the present report, we showed a case of left-right asymmetrical circle of Willis and the inferior cerebellar arteries.<BR>The difference of the diameter between the right middle cerebral artery and left was not recognizable. The diameter of the precommunicating part of the right anterior cerebral artery was markedly small compared with that of the left, but the the diameter of the postcommunicatng part of it was similar to that of the left. The diameter of the anterior communicating artery was also similar to that of the left anterior cerebral artery. Thus, the postcommunicating part of the right anterior cerebral artery seemed to be the extension of the left anterior cerebral artery.<BR>On the other hand, the diameter o f the left posterior communicating artery was remarkably small compared with that of the right, and the precommunicating part of the right posterior cerebral artery was also markedly small comparered with the left. The postcommunicating part of the right posterior cerebral artery seemed to be the extension of the right posterior communicating artery.<BR>The left anterior inferior cerebellar artery normally originated from the basilar artery; the right, however, originated from the right vertebral artery. The diameter of the right posterior inferior cerebellar artery was very small compared with that of the left.<BR>Concerning the blood flow, the right occipital lobe was thought to be received the blood from the right internal carotid artery. In contrast, the left internal carotid artery supplied probably almost no blood to the left occipital lobe. Furthermore, the right anterior lobe was received the blood from the left internal carotid artery rather than the right. Thus, there might be no differences of volume of the blood flow between the right and left cerebral hemisphere. In the present case, however, when embolism occurs once in the internal carotid or vertebral artery system, the unexpected area of the brain would be damaged, and then diagnosis might be confused by symptoms.

収録刊行物

  • 形態・機能

    形態・機能 2 (1), 21-26, 2003

    コ・メディカル形態機能学会

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