Abdominal radiograph Abdominal ultrasound 1 Article 1 Cardiac 1 Congenital heart disease 1 Enterocolitis, Necrotizing 1 Fisher exact test 1 Heart Defects, Congenital 1 Humans 1 Infant, Newborn 1 Infant, Newborn, Diseases 1 Necrotizing enterocolitis 1 Pneumatosis 1 Retrospective Studies 1 Ultrasonography 1 abdominal radiography 1 adult 1 bilious vomiting 1 clinical feature 1 comparative study 1 complication 1 congenital heart disease 1 congenital heart malformation 1 demographics 1 diagnostic imaging 1 diagnostic value 1 echography 1 emphysema 1 female 1 gestational age 1