Bài viết mô tả đặc điểm hình ảnh nang ống mật chủ ở trẻ em trên siêu âm và CHT . Đối tượng và phương pháp nghiên cứu: 44 BN được chẩn đoán là nang OMC trên siêu âm và hoặc trên siêu âm và CHT thời gian từ 7/2012 đến 9/2013 tại BV Nhi Trung Ương. Trong đó có 16 BN được chụp CHT mật tụy sử dụng chuỗi xung HASTE trên máy có công suất | ĐẶC ĐIỂM HÌNH ẢNH NANG ỐNG NGHIÊN CỨU KHOA HỌC MẬT CHỦ Ở TRẺ EM TRÊN SIÊU ÂM VÀ CỘNG HƯỞNG TỪ SCIENTIFIC RESEARCH Imaging characteristics of choledochal cysts in children on ultrasound and MRI Lê Đình Công Nguyễn Duy Huề SUMMARY Purposes The description of Imaging characteristics of choledochal cysts in children on Ultrasound and MRI Material and methods 44 patients were diagnosed choledochal cysts on Ultrasound and or had Ultrasound and MRCP from 7 2012 to 9 2013 in National Hospital of Pediatrics. 16 patients with choledochal cysts underwent MRCP using a half Fourier acquisition single-shot turbo spin-echo sequence. MRCP findings were compared with intraoperative cholangiography. Result In 44 patients choledochal cysts including 34 girls and 10 boys age range 2 months -16 years mean age years. Clinical presentation abdominal pain is the most common symptom vomiting fever jaundice . The type of choledochal cysts according to Todani type I 93 type IVa 7 Type of dilatation cystic dilatation fusiform dilatation mean measurement stone in cyst intrahepatic duct dilatation gallstone . MRCP findings n 16 with the most common form being typeI 14 16 typeIVa 2 16 cystic dialatation fusiform dilatation . Cystolithiasis 75 intrahepatic duct dilatation 56 25 . Kappa value was good agreement k when compared Ultrasound and MRCP. The presence of the anomalous junction of pancreaticobiliary duct was revealed by MRCP in only 10 cases of 13 cases choledochal cysts with Kappa value was good agreement k when compared with intraoperative cholangiography. Conclusion Ultrasound and MRI showed overall good accuracy in the detection and the classification of choledochal cysts and revealed associated complications. MR cholangiopancreatography provides information about anomalous pancreaticobiliary ductal union in children with choledochal cyst. Key words Choledochal cyst .