pyelovenous backflow

py·elo·ve·nous back·flow

noun \-ˈvē-nəs-ˈbak-ˌflō\

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