الفهرس 
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Abstract
Cesarean section is currently the most common obstetric procedure throughout the world. The number of cesarean deliveries increased worldwide in the past 25 years.
Cesarean scar evaluation becomes important nowadays due to increased incidence of delayed scar complications. Reported scar complications included scar defect (niche), abnormal healing, abnormal vascularization, liability for rupture and placental invasion in subsequent pregnancy.
Assessment of cesarean scar is important as non-healthy or poor-healed scar are associated with some complication such as chronic pelvic pain, dyspareunia, and abnormal bleeding. Moreover these poor-healed scars may predispose to preterm labour and uterine dehiscence or rupture in subsequent pregnancy.
Cesarean scar defects are diagnosed by radiologic, ultrasonographic, endoscopic and histologic methods.
Ultrasound estimation of lower uterine segment provides a fairly simple and non-invasive method for prediction of scar dehiscence/rupture. The successful outcome of TOLAC depends on the scar of previous CS, which is directly related to its thickness. Evaluation of thickness of LUS has been found to be a potential factor for predicting scar dehiscence. The risk of scar dehiscence/rupture has been directly related to the thinning of LUS. However, there is controversy over the thickness of LUS above which TOLAC can be offered safely.
This study aimed to evaluate and assessment of cesarean scar thickness following elective and unplanned cesarean section with effect on subsequent pregnancy.
During this comparative cross-sectional study, 100 pregnant women who underwent cesarean sections previously at El-Demerdash Hospital were randomly selected from the outpatient clinic of Ain Shams University Maternity Hospital in the third trimester at term with age >18 years old with single intrauterine pregnancy, previous one cesarean delivery and not in labor.
The pregnant women were assessed by transvaginal ultrasonographic measurement of the Lower Uterine Segment for evaluation of the scar of previous cesarean based on the selection criteria.
This study demonstrated that there was no significant difference between the studied groups regarding previous cesarean delivery; gestational age, birth weight and time passed after.
The current research study revealed that scar thickness was significantly thicker among elective group than among emergency group
The current research study revealed that there was no significant difference between the studied groups regarding medical history from previous section until current delivery.
We concluded that cesarean scars following scheduled sections were found to be thicker than those of emergency cesarean sections.