Vesical gigantism or congenital megacystis.

We report on a child who was born with a large unobstructed bladder with normal trigone and normal ureteral insertions. The differences between vesical gigantism and the congenital megacystis-megaureter syndrome are discussed. In our patient, reduction cystoplasty was efficacious in alleviating the child's symptoms and recurrent urinary tract infections. More cases would be of benefit in confirming the usefulness of this procedure.