Variation in Kidney Length during the Intravenous Pyelogram

The rapid injection of 50 c.c. of 76% Urografin in the investigation of 58 patients with hypertension of suspected renovascular origin was seen to cause, on the average, an increase in the size of the kidneys measured on the intravenous pyelogram. This increase was approximately 0·5 cm at its maximum. An explanation for this size variation is offered.