A urachal cyst is a sac of tissue and fluid ... abdominal pain. Rarely, urachal cysts allow urine to drain out of the belly button. In newborns, the drainage is usually caused by a problem in the ...

When ascites are present, paracentesis may be done. A needle is inserted through the skin into the abdominal cavity to drain fluid. This fluid can be examined under a microscope to look for the ...