Commonest cause of intussusception is -

Intussusception most common cause of intestinal obstruction between 3 mo and 6 yr of age * 60% per cent of patients are younger than 1 yr * 80% of the cases occur before 24 mo * rare in neonates * incidence 1-4/1,000 live bihs * male:female ratio is 4:1 Treatment Reduction of an acute intussusception is an emergency procedure and performed immediately after diagnosis in preparation for possible surgery In patients with prolonged intussusception with signs of shock, peritoneal irritation, intestinal perforation, or pneumatosis intestinalis, hydrostatic reduction should not be attempted success rate of hydrostatic reduction under fluoroscopic or ultrasonic guidance is approximately 50% if symptoms are present longer than 48 hr and 75-80% if reduction is done within the first 48 hr Bowel perforations occur in 0.5-2.5% of attempted barium reductions. The perforation rate with air reduction ranges from 0.1-0.2% Ref: Sabiston 20th Ed. ; Schwaz 11th Ed.