Severe complications of urethral stricture, acute peri-urethral phlegmon can be localized or diffuse. They are characterized by polymicrobial infections. The mortality rates about 7% is the privilege of diffuses forms. The treatment associates medical and surgical procedures, and consists in polyantibiotherapy and excision of suppurative lesions. From a series of 155 cases we analyse the pathogenical, clinical and therapeutical aspects.