Portocaval fistulas are rare and only exceptionally discovered in newborns.
We report the case of a large portocaval fistula associated with portal hy
poperfusion detected at Doppler US imaging in an otherwise asymptomatic 5 w
eek old infant. The patient remained asymptomatic over the following two ye
ars. At that time, preoperative angiogram showed a normal portal venous sys
tem and the fistula was surgically closed. Postoperative US showed a normal
and patent portal system, without evidence of portal hypertension.