Normally, there is one renal pelvis per kidney. Sometimes, however, during fetal development, certain renal anomalies (considered congenital abnormalities) can occur, and double or even triple renal pelvis can be among them.
Multiple renal pelvis sometimes accompanies other congenital diseases or syndromes, but not always.

There are actually 2 degrees of duplicate renal pelvis: complete duplications and partial duplications. Complete duplications involve not only a duplicate renal pelvis, but also a duplicate ureter attached to it. These complete duplications can be the cause of more serious complications, particularly if the duplicate ureter is not fully formed or does not connect properly to the bladder, since either situation can cause urine to back up into the ureter and kidney (reflux).
Generally, surgery is required to correct the abnormalities.

If only the renal pelvis itself is duplicated, and not the ureter, chances are that no complications will ensue. Your urologist or nephrologist may test to determine that the overall size of your affected kidney or kidneys is within "normal" range, which in most cases of partial duplication (i.e. with no uretral duplication) it will be, and the doctor may also check to be sure that the double renal pelvis is not causing any hematuria (microscopic and/or visible blood in the urine). Overall, if it is just the renal pelvis and nothing else that is duplicated, chances are that the situation will not be serious for you.

Only performing IVU and other imaging scans then can see the ureters.
Hmmmm...
Many discoveries today during practical scans. Hah~

Designer
Part of the code
Brushes