Megadolichobasilar Anomaly

Ⅰ．はじめに

　脳底動脈が異常に延長，拡張あるいは迂曲を呈した場合Megadolichobasilar Anomalyと呼ばれている．一方Dandy^4），Sjögren^9），Greitz^6），Breig^2），またBoeri^1）らは，これら脳底動脈の異常が臨床所見と可成りの関係を有すると述べている，その他にも，本症が橋腫瘍，小脳橋角部腫瘍と誤診された報告もある^10，11）．この様に本症は臨床的には決して無視出来ないものであるにも拘らず未だ確実な定義もなく，看過されて来た感がある．そこで経験例に基づいて若干検討を加えてみた．

The marked elongation, widening and tortuosity of the basilar artery are known as the megadolichobasilar anomaly and the diagnosis rests upon radiological findings.

A series of 20 cases, 14 males and 6 females, of megadolichobasilar anomaly was taken and examined from 320 cases of vertebral angiography between 1964 and 1971.

In our series there were two age distributions, one over 30 and other under 10. The age group over 30 consists of 16 cases involving 13 cases of cerebrovascular accident such as intracranial arterial aneurysm, arteriovenous malformation and others.