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Reliability of the Size Evaluation Method for Meningiomas : Maximum Diameter, ABC/2 Formula, and Planimetry Method

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Title: Reliability of the Size Evaluation Method for Meningiomas : Maximum Diameter, ABC/2 Formula, and Planimetry Method
Authors: Ishi, Yukitomo Browse this author
Terasaka, Shunsuke Browse this author →KAKEN DB
Yamaguchi, Shigeru Browse this author
Yoshida, Michiharu Browse this author
Endo, Shogo Browse this author
Kobayashi, Hiroyuki Browse this author
Houkin, Kiyohiro Browse this author →KAKEN DB
Keywords: ABC/2 formula
Maximum diameter
Planimetry method
Volumetric analysis
Issue Date: Oct-2016
Publisher: Elsevier
Journal Title: World neurosurgery
Volume: 94
Start Page: 80
End Page: 88
Publisher DOI: 10.1016/j.wneu.2016.06.108
PMID: 27381669
Abstract: Background: To evaluate the accuracy of tumor size by maximum diameter, ABC/2 formula, and planimetry method using thick-slice and thin-slice magnetic resonance imaging (MRI). Methods: Maximum diameter and tumor volume calculated using ABC/2 formula (V1) and planimetry method with thick-slice MRI (V2) and thin-slice MRI (V3) were examined in 83 meningiomas. Form factor (FF) analysis was performed to assess irregularity of the tumor. V3 values were considered as real tumor volumes. The accuracy of V1 and V2 was evaluated using ratio and difference from V3. Meningiomas were categorized by tumor locations: skull base (anterior, middle, and posterior) and non-skull base (calvaria and other sites). Results: Correlation between maximum diameter and V3 was statistically significant (r = 0.91), but the error was significant in tumors with longer maximum diameters. Correlation between V1 and V3 was significant (r = 0.97). However, V1 tended to be larger in middle skull base meningiomas or in tumors with low FF values (R2 = 0.21). V2 represented relatively accurate volumes in both groups except in the case of small meningiomas. When tumors were demonstrated within 3 fractions on thick-slice MRI, the ratio of V2 to V3 showed significant variability. Conclusions: Using the ABC/2 formula, the volume of meningiomas in the middle skull base or meningiomas with low FF value might be calculated larger than the real tumor volume. The planimetry method with thick-slice MRI demonstrated relatively accurate volumes if the tumor was fractionated in >4 slices.
Rights: © 2016. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:医学院・医学研究院 (Graduate School of Medicine / Faculty of Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 伊師 雪友

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