<prompt> A neonate presents with colicky pain and vomiting with sausage -shaped lump in the abdomen, Diagnosis isEnterocolitisPerforation of the abdomenIntussusceptionAcute appendicitis  <response>: C. i.e. Intussusception 80-B L 25thINTUSSUSCEPTION Typically causes a strangulating bowel obstruction, which can progress to gangrene and perforation Commonest site is ileocolic 80 Majority of affected infants - intussusception is caused by Hypertrophy of Peyers patches hyperplasia of gut lymphoid tissue Either sex, peak incidence is between 5 and 10 months of age Classically presents with colicky pain and vomiting milk then bile Red current Jelly stool Clinical sign include - dehydration, abdominal distension and a palpable sausage shaped mass in the right upper quadrant PR examination may reveal blood or rarely the apex of an intussusceptum Most intussusceptions can be reduced non- operatively using an air or barium enema Most common cause of intestinal obstruction in a neonate is intussusception Barium enema shows pincer-shaped or colied spring deformity or pitch fork sign 1007 S. Das 5th Hirschsprongs disease is best diagnosed by - full thickness rectal biopsy 