A new born girl not passed meconium for 48 hrs, has abdominal distention and vomiting, Initial investigation of choice would be: (A) Manometry, (B) Genotyping for cystic fibrosis, (C) Lower GI contrast study, (D) Serum trypsin immunoblot
Answer is C. bowel obstruction with an absent caecal gas shadow in ileocolic cases. A soft tissue opacity is often visible in children. A barium enema may be used to diagnose the presence of an ileocolic intussusception (the claw sign) Ref: Bailey & Love&;s Sho Practice of Surgery,E25,Page-1196