pyelovenous backflow

noun
py·elo·ve·nous back·flow | \-ˈvē-nəs-ˈbak-ˌflō \

Medical Definition of pyelovenous backflow 

: drainage of fluid from the renal pelvis of a kidney into the renal venous system under certain conditions (as in retrograde pyelography) in which abnormal amounts of pressure occur in a direction opposite to normal

called also pyelovenous reflux

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