<prompt> Feature of post ovulatory endometrium on ultrasound is :Single hyperechoic thin lineThree line signProminent haloProminent Posterior enhancement  <response>: Prominent Posterior enhancement Friends this is a very impoant Question IMPOANT : I have summarised here the appearances of endometrium on transvaginal ultrasound during different stages of normal menstrual cycle. a. Early menses days 1 - 4 Hypoechoic central echo with a thick hyperechoic endometrial echo and posterior enhancement similar to the luteal phase. b. Late menses days 3 - 7 Single hyperechoic thin lines central endometrial echo Hypoechoic halo Hypoechoic central echo representing blood is gone Anterior posterior thickness of the entire endometrial echo complex is only 1 - 3 mm c. Early follicular phase days 5 - 9 Halo present Relatively thin anterior posterior endometrial thickness 6 mm 8 No posterior enhancementdeg Three line sign.deg d. Late follicular phase days 10 - 14 As above with thicker endometrial echo complex 6 mm. 