pyelovenous backflow

noun
py·​elo·​ve·​nous back·​flow | \ -ˈvē-nəs-ˈbak-ˌflō How to pronounce pyelovenous backflow (audio) \

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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