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The uterine caesarean scar defect, also known as uterine niche or isthmocele, is an irregularity in the anterior uterine wall at the site of a previous cesarean section scar. It is associated with obstetrical complications such as caesarean scar ectopic pregnancy, uterine rupture and, the placental accreta spectrum. Women with cesarean scar defects are frequently asymptomatic, but they may also experience abnormal vaginal bleeding, chronic pelvic pain, and infertility.