May Be Caused by

 Common

Autosomal recessive polycystic kidney disease

Choledochal cyst

Hepatic cyst

Hydronephrosis

Hydroureter

Multicystic dysplastic kidney

Ovarian cyst

Ovarian tumor

 Uncommon

Anterior sacral meningocele

Hydrometrocolpos

Intestinal atresia

Meconium pseudocyst

Megacystic-microcolon-hypoperistalsis syndrome

Mesenteric cyst

Omental cyst

Sacrococcygeal teratoma

Splenic cyst

Umbilical vein varix

Urachal cyst

Ureterocele

Urinoma