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Ⅰ.はじめに
内頸動脈或いは前大脳動脈から起こり,中大脳動脈主幹と平行に側方に走り中大脳動脈支配領域の一部分に分布する,異常動脈は副中大脳動脈と呼ばれている.
Crompton2)並びにJain7)によってこの異常動脈が剖検脳の約3%に存在することが指摘されたが,これを生体で脳動脈写によって発見したのは,1968年,半田ら5)が最初であった.その後,脳動脈写によって発見された症例の報告が2,3なされてきたが,剖検例に比較するとはるかに少なく,13例(14個)5,6,8,10,11)に止まっている.
The assessory middle cerebral artery has rarely been documented. Four cases of the anomalous artery were found in 1240 carotid angiograms, the incidence being estimated to be 0.24 to 0.34%. Ages of the patients were 45, 52, 53, and 56. They were two males and two females. In two patients, the angiography was carried out because of positive neurological signs after head injury, and in the other two, because of cerebrovascular stroke.
All the anomalous arteries were found as incidental findings. The angiography was carried out bilaterally in two patients and the anomalous arteries were found only on one side.
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