The aim of the paper is to demonstrate a successful use of ultrasound in the diagnosis of intestinal intussusception in children. Ultrasound decreases the number of irrigographic examinations and reduces diagnostic exposure of children to X-rays. In the last three years 35 children, aged from 3 months to 15 years (average 2 years), had a suspected clinical diagnosis of intussusception. The ultrasound studies revealed intestinal intussusception in 26 patients (74%). There were no false positive or false negative ultrasound findings. In four patients with secondary intussusception the main symptoms were identified (three solid lesions and two Meckel's diverticula). Intraluminal lesions at the apex of intussusception were confirmed by surgery. In 22 patients intussusception was idiopathic. In 15 of these patients (68%), hydrostatic desinvaginations, under combined ultrasound and radioscopic control, were successful. High grade unsuccessful hydrostatic reductions were associated with long persistence of symptoms (2 to 9 days). Ultrasound is reliable in diagnosis of intestinal intussusception and useful in control of hydrostatic reduction. In patients with expected intestinal perforation ultrasound should be combined with fluoroscopy.