Definition: 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]
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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.