Role of Magnetic Resonance Imaging in Evaluation of Uterine Cesarean Section Scar Niche

With increasing cesarean section rate nowadays, the risks of cesarean scar defect (CSD) should increase. CSD is defined by ultrasound imaging as a triangular hypoechoic defect in the myometrium at the site of the previous cesarean section scar. However, patients with CSD are sometimes asymptomatic. Yet, some patients with CSD can have symptoms of abnormal uterine bleeding, pelvic pain, infertility, uterine rupture, and potential risks of adverse pregnancy outcome .There is an association between the size of a niche and postmenstrual spotting. women with a history of CS, the depth and shape of the niche were not significant factors, while a larger niche volume was described in women with postmenstrual spotting. in women with gynecological symptoms, the niches were significantly wider in women with postmenstrual spotting, dysmenorrhea or chronic pelvic pain, and the prevalence of postmenstrual spotting or prolonged menstrual bleeding was higher with a larger diameter of the niche .Magnetic resonance imaging (MRI) has recently shown a promise tool for evaluation of uterine scar thickness. As opposed to ultrasonography (USG), which is the current gold standard for this purpose, MRI reduces observer dependence and has a superior multiplanar capability.

MRI can be used for assessment of lower uterine segment. It provides accurate tissue characterization, independent of patient body mass index .