It was during the Congress of Medicine, conducted last year, I presented a small collaboration titled retropneumoperitoneum in nephritis; work in which I insist, giving a summary, being preliminary, taken in our midst, original and patients of our race. As this is a research, not yet finished, I ask your cooperation, ideas or suggestions, to give definitive about what the present findings give a short preview: renometría live without. When I presented the work at the Congress of medicine you had performed about 300 retroperitoneal insufflation, now I have about 400.