A neonate presented with fever, lathargy, abdominal distension, Vomiting and constipation. Clinically he was diagnsoed as volvulus nenatarum with suspected perforation. Best investigation would be

.Volvulus neonatorum It is predisposed to by arrested gut rotation with a resultant narrow mesentry of the small bowel and caecum. Symptoms:repeated vomiting,dehydration,abdominal distension Abdominal radiography shows evidence of duodenal obstruction. Laprotomy shows distended stomach and coils of small bowel BAILEY AND LOVE&;S SHO PRACTICE OF SURGERY,PG NO:1197,24th edition