On transvaginal examination the muscular layer of the LUS was clearly seen as hypoechoic line between the hyperechoic uterovesical fold and the decidualized endometrium and the chorioamniotic membranes. The scar area was magnified so the scar occupies at least 75% of the image to ensure consistent and accurate measurements. The thickness of the muscular layer of LUS was taken with the measuring caliber placed at the urinary bladder wall-myometrium interface and the myometrial/ chorioamniotic membrane interface .Three measurements of the LUS were taken, and again, the least measurement was recorded.