MRI-based Bosniak version 2019 for Ⅱ, ⅡF and Ⅲ cystic renal masses: improved interobserver agreement by subtraction imaging
10.3760/cma.j.cn112149-20210926-00879
- VernacularTitle:2019版Bosniak Ⅱ、ⅡF及Ⅲ类肾脏囊性病变观察者间一致性评估中MR减影技术的价值
- Author:
Huanhuan KANG
1
;
Wei XU
;
Xu BAI
;
Song WANG
;
Huiping GUO
;
Shaopeng ZHOU
;
Huiyi YE
;
Haiyi WANG
Author Information
1. 解放军医学院，北京 100853
- Keywords:
Magnetic resonance imaging;
Cystic renal masses;
Bosniak classification;
Subtraction imaging
- From:
Chinese Journal of Radiology
2022;56(4):418-424
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To investigate the value of MR subtraction images in improving the interobserver agreement for Bosniak Ⅱ, ⅡF, and Ⅲ cystic renal masses (CRMs) with Bosniak classification version 2019.Methods:From January 2009 to August 2020, 323 patients (335 CRMs) with surgical pathology results and complete preoperative MRI examination (T 2WI, T 1WI precontrast images and enhanced MRI in corticomedullary, nephrographic, and excretory phases) were retrospectively collected in the First Medical Center of PLA General Hospital. The CRMs of Bosniak Ⅱ, ⅡF, and Ⅲ were selected and classified by 2 experienced genitourinary radiologists according to the Bosniak classification version 2019. The "Subtraction" function in the American GE ADW 4.4 workstation was used to perform subtraction images reconstruction on the enhanced images in the corticomedullary, nephrographic, and excretory phases. Blinded to pathologic information, the other 2 radiologists independently classified the enrolled CRM cases with and without subtraction MR images, respectively, with an interval of 1 month. Ultimately, by using weighted Kappa value, interobserver agreement was evaluated, and the differences in weighted Kappa value were compared using the Gwet coefficient. Results:A total of 187 patients with 187 CRMs were enrolled in the study. The results of the classification of Bosniak Ⅱ, ⅡF, and Ⅲ CRMs categorized by 2 radiologists without and with subtraction images showed that 119 and 141 cases were consistent, and 68 and 46 were inconsistent, respectively. The weighted Kappa value for interobserver agreement among two radiologists without and with subtraction MR images was 0.60 (95%CI 0.53-0.68) and 0.73 (95%CI 0.66-0.80), respectively. The interobserver agreement was higher with subtraction images than that without subtraction images ( t=-2.56, P=0.011). Conclusion:According to the MRI criteria of Bosniak classification version 2019, the interobserver agreement for Bosniak Ⅱ, ⅡF, and Ⅲ CRMs could be improved using subtraction MR images, which may facilitate the popularization and application of Bosniak classification version 2019.
