| pyelovenous backflow | Retrograde movement of fluid (urine or injected contrast materials) from renal pelvis into renal venous system. This occurs under conditions of distal obstruction or injection of solutions into renal collecting system. (05 Mar 2000) |
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| backflow | The reversal of the normal flow of a current. See: regurgitation. (05 Mar 2000) |
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| pyelovenous | Denoting the phenomenon of drainage from the renal pelvis into the renal veins from increased intrapelvic pressure. Origin: pyelo-+ venous (05 Mar 2000) |