The appearance of intussusception under ultrasound shows concentric or target ring-shaped mass images on a transverse section scan, and a sleeve sign on a longitudinal section scan. For an ultrasound-guided hydrostatic reduction, a balloon is inserted through the anus and inflated, connecting a T-tube to a Foley catheter with a side tube connected to a sphygmomanometer to monitor water pressure. Isotonic saline at a temperature of thirty to forty degrees is injected, and the target ring-shaped mass image can be seen retracting to the ileocecal region. The disappearance of the concentric circles or sleeve sign under ultrasound indicates the completion of this therapeutic diagnosis.