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Runqi Cheng,1 Tiansheng Wang,1 Yuankun Cai,1 Songshan Chai,1 Lei Shen,1 Dongyuan Xu,1 Jingyi Yang,1 Chuqiao Yue,1 Jianzhang Pu,2 Nanxiang Xiong1 1Department of Neurosurgery, Zhongnan Hospital of Wuhan University, Wuhan, Hubei Province, People’s Republic of China; 2Department of Neurosurgery, Beijing Shunyi District Hospital, Shunyi Teaching Hospital of Capital Medical University, Beijing, People’s Republic of ChinaCorrespondence: Nanxiang Xiong, Email mozhuoxiong@163.comObjective: To predict the volume and shape of the balloon before PBC by reconstructing the Meckel’s cave (MC) and establishing a volumetric measurement model, supporting preoperative preparation and intraoperative decisions.Methods: The clinical data of 31 patients with good therapeutic effects who underwent PBC are retrospectively collected, including preoperative MRI, the volume of contrast agent injected into the balloon, and intraoperative lateral X-ray images. The MC on the affected side of the 31 patients is reconstructed based on MRI using 3D Slicer, while the volume of the MC is calculated to compare with the volume of contrast agent. The width (W) and length (L) of the model of the MC in lateral view are measured and used to classify the shape of the MC based on W/L. The consistency between the W/L of the model of the MC and the W/L of the intraoperative balloon is evaluated.Results: For volume, the mean value of the models of the MC (V1) in 31 patients is 399.77± 155.13 mm³, while the mean value of the contrast agent injected during PBC (V2) is 539.03± 111.93 mm³. The formula obtained by linear regression is V2= 392.1 + 0.3676×V1. Based on the value of W/L, the shape of the MC is classified into thin “pear” in 5 patients (16.13%), standard “pear” in 22 patients (70.97%), and square “pear” in 4 patients (12.90%). There is no significant difference in W/L between the models of the MC and the intraoperative balloons in 31 patients (P=0.221).Conclusion: In 31 patients wit