[Experimental investigations on the effect of progesterone on contrast excretion (author's transl)].

The relationship between high dose progesterone treatment and pregnancy and dilatation of the upper urinary tract was investigated by doing intravenous urograms on eight female rabbits. Ten features of the urogram were studied. It was concluded that the administration of sex hormones to rabbits without any mechanical change in the ureters, did not lead to urographically demonstrable dilatation of the ureters. Negative findings in pregnant animals indicate that the mechanical situation in rabbits differs from that found in human pregnancy. The results are discussed with relation to the available literature.