Dilatation of the urinary tract during pregnancy and its management.

Dilatation of the upper urinary tract in pregnancy is caused by an obstruction at the pelvic brim, of varying degree. In some women this obstruction occurs acutely, resulting in renal colics. Our experience with this condition in 17 patients is reported. In 7 patients relief of the obstruction was necessary. The method of choice was drainage with pig-tail stents. The indications for such treatment are discussed.