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Summary Purpose To show the importance of the medical imagery in the diagnosis of the posterior urethral valves. Patients and methods It was a retrospective study carried oud in the service of Urology of the CHU of Brazzaville concerning 3 cases of posterior urethral valves, ovserved between 1996 and 2003. The diagnosis was performed by the uretrocystography supplemented by ultrasonography. Results Our observations concerned 3 boys whode age varied between 3 and 5 years. The uretrocystography showed 3 posterior urethral valves type I of Young, one of the children having moreover a calculation wedged in the posterior urethra. The treatment consisted in a destruction of the valves with Béniqué's sound followed by putting a tube, one of the case having profited in addition a cystolithotomy. Conclusion the diagnosis of the posterior urethral valves is primarily done by uretrocystography supplemented by ultrasonography. The destruction of the valves after an early diagnosis makes it possible to obtain good results concerning the urinary function.