Abstract
A phlebographic study of the renal venous tree was made in 24 cases of hydronephrosis. There was an alteration in the renal phlebographic pattern, the most characteristic appearance being the visualisation of extensive free anastomoses among the branches of the renal vein. Elongation of the branches of the renal vein, which is not as typical nor as constant, is presumably caused by enlargement of the pelvis and the distended calyces. In more advanced stages there is a visualisation of a fine network located peripherally to the previously described anastomoses. When there is a secondary disruption of the renal parenchyma there is no visualisation of the branches of the renal vein.
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