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Summary Purpose To assess the capabilities of a velocity ratio > 3 for the diagnosis of Budd-Chiari syndrome (BCS) in children after split liver transplantation using Doppler ultrasonography (DUS). Materials and methods A total of 28 children who underwent liver transplantation using a split procedure were included. There were 11 boys and 17 girls with a mean age of 3.8 years (range: 0.7–12 years). Velocity ratio between blood velocity upstream of the anastomosis and that at the level of the inferior vena cava anastomosis was calculated. Sensitivity, specificity and accuracy of DUS for the diagnosis of BCS were estimated using a velocity ratio > 3. Results Eight children (8/28; 29%) had BCS and 20 (20/28; 71%) did not have BCS using the standard of reference. A velocity ratio > 3 on DUS yielded 88% sensitivity (95% CI: 53–98%), 80% specificity (95% CI: 58–92%) and 82% accuracy (95% CI: 64–92%) for the diagnosis of BCS. Conclusion A velocity ratio > 3 on DUS is a reliable finding for the diagnosis of BCS in children after split liver transplantation.

Purpose To study the complementary diagnostic value and role in the perinatal management of foetal MRI in the prenatal diagnosis of abnormalities of the urinary tract. Patients and methods Retrospective monocentric study from November 2002 to June 2011 of foetuses benefiting from an MRI after ultrasound diagnosis of uronephropathy abnormalities. Ultrasound and MRI data were compared with postnatal radiological and/or surgical data or with the foetopathology. The MRI analysis focused on the diagnostic concordance with the ultrasound, the complementary diagnostic contribution and/or a change in perinatal care. Results Of the 154 MRI examined, a follow-up was obtained for 108 cases. The indications for MRI were classified into six groups: suspected renal agenesis ( n = 20, 18.5%), posterior urethral valve ( n = 20, 18.5%), reflux or megaureter ( n = 14, 13%), uretropelvic junction syndrome ( n = 24, 22.5%), enlarged kidneys ( n = 7, 6.5%) and others ( n = 23, 21%). The information supplied by ultrasound was confirmed by MRI in 72 patients (67%). MRI provided additional data for 36 patients (33%) and changed the perinatal care for 16 patients (15%). Conclusion Foetal uro-MRI is a useful complementary tool in the prenatal diagnosis of some uropathy abnormalities.