Social & Preventive Medicine Other FP Methods and New Initiatives in Family Planning 21273ec5 A man underwent vasectomy, but 6 months later his wife was 16 weeks pregnant. What is the most likely cause? A Failure of operative procedure B Pregnancy antedating vasectomy C Recanalization of vas D Failure to use additional contraception in postoperative period High-Yield Explanation - Misidentification of Vas deferens by Surgeon is the MCC of Failure in Vasectomy.