Urinary ascites can be diagnosed in the fetus or in the newborn period.
Ascites is commonly caused by urinary extravasation resulting from
urinary tract obstruction or trauma. Sahdev et al., in 1997, reported
that extravasation of urine occurred most commonly as a result of
forniceal rupture in the kidney. Some authors believe that extravasation of urine is a protective mechanism, decreasing the amount of
damage to the kidneys from obstruction. Bladder perforation as
a result of umbilical artery catheterization can also lead to urinary ascites. The diagnosis can be made by ultrasonography and VCUG in most cases, and the bladder should be surgically repaired.