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The authors report three cases of cystic tumors of the kidney: one benign papillary tumor and two renal cell carcinomas. Although the clinical features were atypical, the authors emphasize the role of computer tomography which make easier the diagnosis of these scarce tumors. When the diagnosis is doubtful a guided needle biopsy is recommended.

It is admitted that the risk of developing an uro-colonic tumor in patients operated by an ureterosigmoidostomy (USS) is several hundred times higher more than in the normal population. However, the evolution of these tumors and the mechanisms of this particular type of carcinogenesis are not yet totally cleared. The analysis of the observations described in the literature and the recent datas on experimental models contribute to a better understanding of the natural history of these tumors. In this review, we have on one hand defined the clinical profile and the biological behaviour of these tumors with their practical approach and on the other hand discussed the different elements and hypothesis involved in this carcinogenesis after USS.

The authors report their experience with 37 patients treated by internal urethrotomy for urethral strictures. The results were appreciated on urethral calibration and flow rate after a median follow-up of 33,5 months and a minimal follow-up of one year. The rate of satisfying results was 78,3%. The authors emphasize the need of dilatations associated to low-doses of cortico-steroids in the post-operative period during the first three months, to improve the results.

The authors study the incidence of urethral strictures after transurethral resection of prostate. A retrospective study of 135 patients and a prospective study of 187 patients found respectively 74% and 3.2% of urethral stenosis. Two important data are seen in this study, the duration of urethral catheter of 24 hours post operatively and the internal urethrotomy when they found a pathologic urethra pre operatively reduce the incidence of urethral strictures. With a normal urethra pre operatively and 24 hours of urethral catheter post operatively, any stenosis occurred, equally when an internal urethrotomy is done with a pathologic urethra pre operatively.

We have reported diffuse endophytic lesions that we have defined as being an inverted micropapillomatosis. There are benign proliferative lesions that we can classify between the Von Brunn nets and the other proliferative urothelial lesions.

The authors study the incidence of urethral strictures after transvesical prostatectomy. A retrospective study of 90 patients and a prospective study of 78 patients found respectively 2% and 0% of urethral stenosis. The important data of this study is the duration of urethral catheter post operatively.