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Dilation of the pelvis and calyces of one or both kidneys. This may result from obstruction to the flow of urine, vesicoureteral reflux, or it may be a primary congenital deformity without an apparent cause.
[hydro- + G. nephros, kidney, + -osis, condition]


Dilation of kidney pelvis and ureter, seen in hydronephrosis due to obstruction in the lower urinary tract.
[pyelo- + ureter + G. ektasis, a stretching]


Dilatation of the pelvis of the kidney and ureter.
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