<prompt> Intussusception is caused by:Submucous lipomaSubfascial lipomaSubserous lipomaIntramural lipoma  <response>: a. Submucous lipomaRef: Nelsons 20e p 1812-1814, Ghai 8e p 287Predisposing conditionsPeyers patches or prominent mounds of lymph tissue lead to mucosal prolapse of ileum into colon;Other lead points: Meckel diverticulum, intestinal polyp, neurofibroma, intestinal duplication cysts, hamartomas, ectopic pancreatic tissue, hemangioma, lipomaClinical featuresSudden onset of severe paroxysmal colicky pain in a previously well child, that recurs frequently60 infants pass a stool containing red blood and mucus, the currant jelly stoolVomiting occurs in most cases and is usually more frequently in the early phase. 