Necrotizing enterocolitis and volvulus in the premature neonate.

Premature infants presenting to the neonatal intensive care unit at the Hospital for Sick Children with a surgical abdomen over a 5-year period were studied retrospectively to determine the factors leading to the diagnosis of malrotation with volvulus and necrotizing enterocolitis (NEC). Fifteen preterm infants (less than 37 weeks) were diagnosed as having volvulus, and 54 had surgically treated NEC. Those with NEC were more likely to be systematically ill with grossly bloody stools, abdominal tenderness, and thrombocytopenia (P less than .005). Bilious vomiting and bilious gastric residuals were the only hallmarks of volvulus (P less than .005). Although the radiographic findings of thickened bowel walls and intramural air were significantly related to NEC, the accuracy and interobserver reliability in diagnosing these features was variable as was the ability to distinguish NEC from volvulus or normal on plain abdominal radiographs. Volvulus is an important cause of surgical abdomen in the preterm infant and can be misdiagnosed as NEC. An unusual course or the presence of bilious vomiting in any patient thought to have NEC should alert the clinician to the possibility of this diagnosis.