Tissue defects which seen on uterine scars of the cesarean sections are encountered rarely. The defects that are not causing a specific symptom can be identified by a detailed ultrasonography (USG) or hysterosalpingography (HSG). In this case report, a defect which is originated from the scar tissue of cesarean section will be presented. The patient had one child and she was being investigated because of secondary infertility. A defect was visualized on the uterine scar tissue due to prior cesarean section in USG and it was confirmed with HSG. Uterin defect was corrected by a metroplasty operation and after one month, transvaginal USG revealed a completely intact uterin scar site. Patients who underwent uterine operations such as cesarean section should be evaluated by USG and it must be made sure that the uterine scar healed completely. Copyright © 2010 by Türkiye Klinikleri.