Summary
In the last 9 years, infundibular dilatation (ID) has been sought in 260 aneurysm (An) cases and 398 carotid angiogram's (CAG) to reveal its incidence and morphology. Findings were as follows:
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1)
The incidence was about double that so far published.
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2)
Small ID, usually triangular in shape, tended to become round as it grew larger (P<0.01).
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3)
Large ID favored young age (P<0.05).
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4)
In internal carotid-posterior communicating aneurysm (IC-P com-An) cases, a high incidence of ID was noted as compared to other An cases (P<0.05), and intermediate or large, round ID accounted for high ratios.
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5)
Cases with a history of hypertension showed a high large ID ratio (P<0.05).
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6)
Cases with well developed P com A had a high ratio of large, round ID (P<0.01).
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7)
In cases with a large divergent angle of ICA and P com A, intermediate or large, round ID was found in high ratio (P<0.05).
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8)
Aggressive follow-up or treatment was thought necessary in cases which posses the factors mentioned.
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Ebina, K., Ohkuma, H. & Iwabuchi, T. An angiographic study of incidence and morphology of infundibular dilatation of the posterior communicating artery. Neuroradiology 28, 23–29 (1986). https://doi.org/10.1007/BF00341761
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DOI: https://doi.org/10.1007/BF00341761