Background: The incidence of uterine scar dehiscence in gravid women is increasing because of increasing rates of cesarean section and other uterine surgeries. Most previous reports have described expectant management without proactive measures. This report describes the successful early second trimester repair of a partially dehiscent uterine scar. Case presentation: A 29-year-old woman was found to have a dehiscent cesarean scar on routine ultrasonography performed at 9 weeks' gestation. Surgical repair was performed at 13 weeks to reduce the protruding gestational sac and close the uterine scar. The patient's recovery was uneventful and she underwent a successful cesarean delivery at 36 weeks. Conclusion: The early detection and timely repair of a dehiscent scar in pregnant women may prevent maternal and fetal complications.