Prenatal MRI findings of type Ⅰ congenital choledochal cyst and parameter measurement of liver and gallbladder
Objective:To observe the MRI findings of type Ⅰ congenital choledochal cyst (CCC) during the fetal period,analyze the differences in CCC fetal lung-to-liver ratio,liver,spleen,gallbladder,and portal vein measurement parameters compared to normal fetuses. Materials and Methods:Follow-up analysis of clinical data and fetal MRI manifestations of 31 confirmed postnatally operated CCC patients. Observations included the morphology,course,connection with bile duct or gallbladder,relationship between the lower edge of the lesion and the lower edge of the liver,and measurement and calculation of the volume of the choledochal cyst. A control group of 90 healthy fetuses was used for comparison,analyzing differences in fetal lung to liver signal intensity ratio,liver (left and right diameters,upper and lower diameters,maximum cross-sectional area,apparent diffusion coefficient of the liver),spleen (length,thickness,maximum cross-sectional area),gallbladder (length,short diameter,length-to-short diameter ratio,maximum cross-sectional area),and portal vein diameter. The correlation between choledochal cyst volume and MRI measurement parameters was also analyzed. Results:Among the 31 CCC patients,there were 9 male fetuses and 22 female fetuses,with a male-to-female ratio of approximately 1:2.4. Among them,26 cases had elliptical-shaped lesions,and 5 cases had cystic lesions. In all 31 cases,a pointed angle sign was observed at the upper end of the lesions. The lower edge of the lesions did not exceed the lower edge of the liver in 29 cases,while in 2 cases,the lower edge extended beyond the liver. The course of the lesions in 26 cases was from the upper right to the lower left. There was no statistically significant difference (P>0.05) in fetal lung to liver signal intensity ratio,liver dimensions (left and right diameters,upper and lower diameters,maximum cross-sectional area,apparent diffusion coefficient),spleen dimensions (length,thickness),gallbladder dimensions (length,short diameter,maximum cross-sectional area) between the CCC group and the control group. However,there were statistically significant differences (P<0.05) in the maximum cross-sectional area of the spleen,portal vein diameter,and the ratio of gallbladder length to short diameter between the lesion group and the control group fetuses. Further statistical analysis revealed no correlation (P>0.05) between the volume of the choledochal cyst and the maximum cross-sectional area of the fetal spleen,the ratio of gallbladder length to short diameter,and portal vein diameter. Conclusions:CCC is more common in females. The fetal MRI manifestations include elliptical-shaped lesions,generally not extending beyond the lower edge of the liver. The course of the lesions is often from the upper right to the lower left,with a pointed angle sign at the upper end. The affected fetuses exhibit an enlarged spleen,widened portal vein,and an increased ratio of gallbladder length to short diameter. However,there is no correlation between the volume of the lesion and the maximum cross-sectional area of the fetal spleen,portal vein diameter,and the ratio of gallbladder length to short diameter.
国家科技期刊平台
NSTL
万方数据
