Abstract
SUMMARY: Two patients are discussed who presented with anuria. The azotremia returned to normal after a unilateral nephrostomy and the patients went home. At a later date (86 and 348 days) the obstruction in the other kidney was relieved and the normal secretion of urine was resumed.The dangers of prolonged ureteric obstruction and the necessity of re‐establishing drainage of urine even at a late stage are discussed in relation to experiments with animals and in clinical practice.I would like to thank the staff of the Regional Urological Centre at Sefton General Hospital, Liverpool, for their help in carrying out the renograms; the Liverpool Radium Institute Isotope Department for assistance in the supply of radioactive hippuran; also Mr E. C. Edwards for permission to publish details about his patient (G. W.). I am especially grateful to Mr Cosbie Ross for assistance in preparing this paper and permission to describe his patient (R. L.).

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