The authors present their 13 cases of sterilization in which a spontaneous recanalization of tubes occurred. Out of these 13 cases, 11 underwent sterilization after the operative Madlener method, while in the remaining 2 cases a laparoscopic method by thermocoagulation was applied. Recanalization in most cases (7) developed 15 or more months after operative sterilization. An adequate passage of tubes was verified in 12 cases through pregnancy, while only in one case HSG was applied, showing a spontaneous recanalization of the right tube.