[Etiology, occurrence and types of the internal carotid artery loop].
Internal carotid loop was studied in 99 patients out of 1638 cases subjected to angiography. The presence of a loop was arbitrarily accepted when in the tortuous part of the artery one of its segments was situated below the preceding segment. For the spatial analysis of the tortuous part of the artery and its image in the plane of the radiogram a model was used simulating various variants of the course of the internal carotid artery. On the ground of the analysis of the spatial configuration of the arterial loops and the variability of the loop model in the plane of the radiogram six types of the loop were isolated. The loops were found in 9.2% of patients with bilateral angiography and 5.7% of those with unilateral angiography. In adults the loop was present in 5.4% of cases, and in children in 8.9% (statistically significant difference p less than 0.05). It is assumed that the loop in children is a congenital anomaly, while in adulthood besides the congenital etiology an acquired form of the loop is to be taken into account.
I Katedry i Kliniki Neurologii Sl. AM.
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D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002343:Carotid Artery, Internal / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000196:embryology; D002533:Cerebral Angiography; D002648:Child; D006801:Humans; D002538:Intracranial Arteriovenous Malformations / Q000145:classification / Q000000981:diagnostic imaging / Q000209:etiology*; D008875:Middle Aged
Etiologia, czestość wystepowania i typy ukształtowania petli naczynio-wej w przebiegu tetnicy szyjnej wewnetrznej.