Abstract
The upper urinary tracts in twenty-nine pregnant women in later months of pregnancy were examined by excretory urography.
The dilatation of the renal pelvis and ureter was far more frequently observed on the right side than on the left. In the majority of cases the position of the right renal pelvis was found to be abnormal; not rarely, the position of the right renal pelvis was higher than the left renal pelvis. From the present study, it was concluded that the dilatation of the right upper urinary tract in pregnant women is primarily caused by the mechanical factor of the dextro-rotated gravid uterus and secondarily by the endocrine function of the placenta.
