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American Journal of Oral Medicine and Radiology

Volume 5, Issue 2, 2018
Mcmed International
American Journal of Oral Medicine and Radiology
Issn
XXX-XXXX (Print), 2394 - 7721 (Online)
Frequency
bi-annual
Email
editorajomr@mcmed.us
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Abstract
Title
PATTERN OF CIRCLE OF WILLIS ARTERIAL VARIANTS AND ANOMALIES IN NON-CONTRASTED THREE-DIMENSIONAL TIME-OF-FLIGHT MR ANGIOGRAPHY
Author
K.M.Navas* and Gurusiddhanagouda
Email
ramspsm@gmail.com
keyword
Circle of Willis, Anatomic variation, MR scanner.
Abstract
Considerable anatomic variation exists in the Circle of Willis. There are ten types of variation (A to J) in anterior and posterior circle. In one study, common variation the proximal part of the posterior cerebral artery is narrow and its ipsilateral posterior communicating artery is large, so the internal carotid artery supplies the posterior cerebrum. In another variation the anterior communicating artery is a large vessel, such that a single internal carotid supplies both anterior cerebral arteries. A total of 300 healthy participants (198 men, 102 women; mean age, 55 years) who underwent three-dimensional time-of-flight (3D-TOF) MR angiograms of the circle of Willis (CoW) were obtained with the sequence of spoiled gradient-recalled acquisition (SPGR) using a 1.5-tesla MR scanner (Achieva; Philips Medical Systems) at the Department of Radio diagnosis. Among the subjects studied, commonest variant is type e. It is commonest among male (34.8%). Type i is not found in the study population. Among the subjects studied, commonest variant is type e. It is commonest below 50 yrs [61 of 113 (54%)]. Type i is not found in the study population. The most common posterior circle variant is type E.
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