Objective To explore the diagnostic value of MR fast imaging sequences in fetal lung congenital cystic adenomatoid malformation(CCAM).Methods 8 cases with suspected CCAM by US were examined with MRI fast sequences,including single shot turbo spin echo (SSTSE)and balanced fast field echo(B-FFE),and undergone axial,sagital and coronal scanning sections of fetal chests.MRI findings were compared with surgery(2 fetuses),autopsy (3 fetuses)and CT examination (3 fetuses).Results 7 fetuses with CCAM and 1 fetus with bronchopulmonary sequestration(BPS)diagnosed by MRI were confirmed by following surgery,autopsy and CT examination.Among the 7 CCAM cases,2 leisions were on the left side,while the other 5 lesions were on the right side.Fur-thermore,2 cases were cystic type and the rest 5 cases were mass type.The BPS was located in the lower left lung lobar.Conclusion MR fast imaging sequences in fetal can clearly demonstrate location,type and extent of CCAM and can provide important supplement information of the prenatal fetal ultrasound examination.

Objective To investigate the value of MRI in the prenatal diagnosis of abnormal fetal kidneys. Methods From December 2014 to March 2016, 51 women underwent MRI and were confirmed as having fetuses with abnormal fetal kidneys when follow up. Their clinical and MRI profiles were analyzed retrospectively, including MRI manifestation, the fetal kidney signal intensity of diffusion-weighted imaging (DWI) and apparent diffusion coefficient (ADC). The signal intensity of DWI and ADC of the abnormal kidney and the normal opposite kidney, and those of the normal and abnormal kidneys in different individuals were compared. The accuracies of MRI and ultrasound in evaluating abnormal fetal kidneys were also compared. Results MRI could accurately demonstrate the morphological features of abnormal fetal kidneys. There was no statistically significant difference between DWI signal intensity and ADC value of the abnormal kidney[368 ± 125,(1.516 ± 0.420)× 10-3 mm2/s] and the normal opposite one[410 ± 125,(1.362 ± 0.251)× 10-3 mm2/s], P values were 0.165 and 0.184,respectively. The DWI signal intensity of normal kidneys(401 ± 124)was higher than that of renal cysts(182 ± 40, P<0.01), and the ADC value of normal kidneys[(1.306 ± 0.252)× 10-3 mm2/s] was lower than that of renal cysts[(2.912 ± 0.235)× 10-3 mm2/s] and multicystic dysplastic kidneys[(1.870 ± 0.654)× 10-3 mm2/s], P values were<0.01 and 0.045, respectively. The diagnostic accuracy of MRI and prenatal ultrasound for abnormal fetal kidneys were 94%(63/67)and 85%(57/67), respectively. However, there was no statistical difference between the two methods (P=0.070). Conclusion MRI have an important role in the prenatal diagnosis and evaluation of abnormal fetal kidneys.