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Original research
Morphological characteristics associated with the rupture risk of mirror posterior communicating artery aneurysms
  1. Guang-xian Wang1,
  2. Jun Liu2,
  3. You-qiang Chen3,
  4. Li Wen1,
  5. Ming-guang Yang2,
  6. Ming-fu Gong1,
  7. Dong Zhang1
  1. 1 Department of Radiology, Xinqiao Hospital, Third Military Medical University, Chongqing, China
  2. 2 Department of Radiology, Chongqing Emergency Medical Center, Chongqing, China
  3. 3 Department of Radiology, Daping Hospital, Third Military Medical University, Chongqing, China
  1. Correspondence to Dr Dong Zhang, Department of Radiology, Xinqiao Hospital, Third Military Medical University, Chongqing 400037, China; xqzhangdong{at}


Objective Patient related clinical factors and intracranial aneurysms (IAs) at different locations may lead to statistical bias when investigating the rupture risk of IAs. Thus the purpose of this study was to identify the morphological parameters that are related to the rupture of mirror posterior communicating artery aneurysms (PComAAs).

Methods Between August 2011 and July 2017, 68 patients with mirror PComAAs and aneurysmal subarachnoid hemorrhage were diagnosed by CT angiography at three medical centers. Morphological characteristics for PComAAs included bifurcation, shape, neck width, width, depth, maximum size, flow angle, parent vessel diameter, aspect ratio (AR), depth/width ratio, bottleneck factor, and size ratio (SR). Multiple logistic regression analysis was performed to determine the independent risk factors for rupture. Receiver operating characteristic curve analysis was performed to obtain the optimal thresholds.

Results AR (OR 5.623) and SR (OR 5.570) were more commonly observed in the ruptured cohort. The threshold values of AR and SR were 0.98 and 1.21, respectively.

Conclusions Mirror PComAAs are a useful model to investigate the rupture risk of PComAAs. AR (≥0.98) and SR (≥1.21) are better predictors of ruptured PComAAs.

  • aneurysm
  • ct angiography

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  • Contributors Conceptualization: DZ. Data curation: LW. Investigation: JL, Y-QC, M-GY, and M-FG. Methodology: DZ. Writing original draft: G-XW.

  • Funding The study was supported by the Research Project of Third Military Medical University (2016YLC22).

  • Competing interests None declared.

  • Patient consent Obtained.

  • Ethics approval The study was approved by Xinqiao Hospital’s institutional ethics committee; Daping Hospital’s institutional ethics committee; and Chongqing Emergency Medical Center’s institutional ethics committee.

  • Provenance and peer review Not commissioned; externally peer reviewed.