A 15-month-old black male with trisomy 21 and Hirschsprung's disease d
eveloped an inflammatory abdominal pseudocyst 1 month after Swenson pu
ll-through repair. Although abdominal pseudocyst associated with ventr
iculoperitoneal shunts, peritoneal dialysis catheters, meconium perito
nitis, and pancreatitis have been reported, this is the first report o
f a pseudocyst developing 1 month after a surgical repair of Hirschspr
ung's disease.