pyelovenous backflow

py·elo·ve·nous back·flow -'vē-nəs-'bak-.flō n 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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backflow of fluid from the renal pelvis into the venous system under certain conditions of back pressure.