Step 1 → Gastrointestinal Congenital and NeonatalPreview this topic sectionPreview the conditions. Plans unlock the full Step 1 details when you need them. Free Biochemistry Free Microbiology Plans Congenital and Neonatal conditions Duodenal Atresia Esophageal Atresia with Distal Tracheoesophageal Fistula Hirschsprung Disease Hypertrophic Pyloric Stenosis Jejunal and Ileal Atresia Meckel Diverticulum Necrotizing Enterocolitis (NEC) Pure Esophageal Atresia (Atresia or Stenosis) Pure Tracheoesophageal Fistula (H-type)