الفهرس 
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Abstract
A ureteropelvic junction obstruction (UPJO) can be considered a restriction to flow of urine, from the renal pelvis to the proximal ureter causing dilatation of the renal pelvis (hydronephrosis), which, if left uncorrected, leads to progressive renal deterioration (Koff et al 1986).There is a disagreement regarding the definition of UPJO. Although the concept that congenital obstruction is an “impairment of urine flow that will produce a reduction in function if left uncorrected” is logical, it misses several important elements in the context of congenital obstruction (Koff 1987) . One is that the developing kidney should be increasing its function, not remaining static. It also does not provide any insight into the interpretation of a kidney that has reduced function when diagnosed. Strictly interpreted, this kidney is already affected and by definition is “obstructed.” This interpretation has not been used clinically, however, and it is only on prospective follow-up that a decrease from normal is considered by many to be indicative of “obstruction.” A more useful definition might be that any condition that has or will limit ultimate functional potential should be considered clinically significant obstruction (Peters 1995).