[Analysis of ultrasonic features of abdominal and retroperitoneal lipoblastoma in children].

To analyze the ultrasonic features of abdominal and retroperitoneal lipoblastoma in children. A retrospective analysis was performed on the ultrasonic images of 6 children with abdominal and retroperitoneal lipoblastoma confirmed by surgical and pathology in Tianjin Children's Hospital from July 2019 to January 2025. There were 1 male and 5 females, with a median age of 5 years (range: 5 months to 6 years). All patients presented with a single lesion, 2 located in the retroperitoneum, 2 in the mesentery, and 2 in the greater omentum. The median maximum diameter was 98.5 mm (range: 43-130 mm), and all masses were larger than 30 mm in maximum diameter. Ultrasound findings: well-defined margins in 6 cases, lobulated morphology was seen in 4 cases. Irregular ring-shaped extensive calcification with posterior acoustic shadow was detected in 1 case, cystic areas within the masses were noted in 2 cases, small vessel penetration in the masses was visualized in 2 cases, blood flow signals within the masses were detectable in 3 cases. All 6 cases showed a predominantly hyperechoic mass with cord-like hyperechoic areas (fat-like echogenicity). Preoperative ultrasound suggested lipoblastoma in 5 cases, and teratoma in 1 case at initial diagnosis. The typical ultrasonic features of abdominal and retroperitoneal blastoma in children are solitary, large, possibly lobulated, and well-defined fat-like echo masses, with certain characteristic ultrasonic manifestations. Combined with clinical characteristics such as age, ultrasound as a safe and non-invasive imaging method, can be used as a routine examination for screening and the main method for long-term follow-up.