The purulent retention of the upper urinary tract is fortunately a rare urologic complication for the pregnant women. It decompensates a congenital or acquired uropathy. It is an important urologic emergency in which the diagnosis of obstruction, and the drainage of urines must be of immediate necessity as important as antibiotherapy, to avoid pyonephrosis and the destruction of the kidney. Concerning 3 cases, treated in the stage of pyonephrosis in the department of urology in Susa, we emphasize a premature diagnosis, which can only be done through an ultrasonography, the only guarantee to preserve the kidney. When possible, percutaneous nephrostomy constitutes an excellent means of drainage, while expecting a final disappearance of the obstruction.
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