Abstract:Retroperitoneal tumors are common in childhood,At present,the main diagnostic methods are US, CT and MRI.Contrast-enhanced ultrasound has been widely used in the diagnosis of adult diseases. In recent years, it has also been initially used in children''s liver and other diseases, but it is rarely used in children with retroperitoneal tumors.This article will review the application of contrast-enhanced ultrasound in common malignant tumors of retroperitoneum in children, and compare its advantages with conventional ultrasound.