<unk><unk>  (UPJ) obstruction is a blockage in the area that connects the renal pelvis (part of the kidney) to one of the tubes (ureters) that move urine to the bladder.<unk>  <unk>  is defined as<unk> al or anatomic obstruction to urine flow from the renal pelvis into the ureter at their anatomic<unk> . 
If left untreated, results in symptoms, renal damage, or both.<unk>  generally implies a congenital partial proximal ureteric obstruction detected in utero or in later life.
Ureteropelvic junction obstruction
Bladder outlet obstruction
Ejaculatory duct obstruction
Urethral stricture
Urinary bladder hernia
Urethral caruncle
Duplicated collecting system
Vesicoureteral reflux