Optimizing the US Diagnosis of Biliary Atresia with a Modified Triangular Cord Thickness and Gallbladder Classification

医学 胆道闭锁 胆囊 胃肠病学 放射科 内科学 黄疸 肝移植 移植
作者
Luyao Zhou,Wei Wang,Quanyuan Shan,Baoxian Liu,Yanling Zheng,Zuo‐Feng Xu,Ming Xu,Fu‐shun Pan,Ming‐De Lu,Xiaoyan Xie
出处
期刊:Radiology [Radiological Society of North America]
卷期号:277 (1): 181-191 被引量:56
标识
DOI:10.1148/radiol.2015142309
摘要

Purpose To evaluate the diagnostic performance of ultrasonography (US) in the identification and exclusion of biliary atresia with a modified triangular cord thickness metric together with a gallbladder classification scheme, as well as hepatic artery (HA) diameter and liver and spleen size, in a large sample of jaundiced infants. Materials and Methods The ethics committee approved this study, and written informed parental consent was obtained. In 273 infants with conjugated hyperbilirubinemia (total bilirubin level ≥ 31.2 μmol/L, with direct bilirubin level > indirect bilirubin level), detailed abdominal US was performed to exclude biliary atresia. Biliary atresia was found in 129 infants and ruled out in 144. A modified triangular cord thickness was measured at the anterior branch of the right portal vein, and a gallbladder classification scheme was identified that incorporated the appearance of the gallbladder and a gallbladder length-to-width ratio of up to 5.2 when the lumen was visualized, as well as HA diameter and liver and spleen size. Reference standard diagnosis was based on results of one or more of the following: surgery, liver biopsy, cholangiography, and clinical follow-up. Area under the receiver operating characteristic curve (AUC) analysis, binary logistic regression analysis, Fisher exact test, and unpaired t test were performed. Results Triangular cord thickness, HA diameter, ratio of gallbladder length to gallbladder width, liver size, and spleen size exhibited statistically significant differences (all P < .05) between the group with biliary atresia and the group without. AUCs of triangular cord thickness, ratio of gallbladder length to width, and HA diameter were 0.952, 0.844, and 0.838, respectively. Logistic regression analysis demonstrated that these three US parameters were significantly associated (all P < .05) with biliary atresia. The combination of triangular cord thickness and gallbladder classification could yield comparable AUCs (0.915 vs 0.933, P = .400) and a higher sensitivity (96.9% vs 92.2%), compared with triangular cord thickness alone. Conclusion By using the combination of modified triangular cord thickness and gallbladder classification scheme, most infants with biliary atresia could be identified. © RSNA, 2015
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