This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gynaecological Diagnosis, Subject name: Gynaecology & Obstetrics
Feature of post ovulatory endometrium on ultrasound is: 
Select and explain. 
A. Single hyperechoic thin line, B. Three line sign, C. Prominent halo, D. Prominent posterior enhancement
D: Prominent posterior enhancement
Answer: D: Prominent posterior enhancement 
Explanation: Ans. is d, i.e. Prominent posterior enhancementRef: Transvaginal Ultrasound by Melvin G. Dodson 1st/ed, p86This is a very important QuestionIMPORTANT: The appearances of endometrium on transvaginal ultrasound during different stages of normal menstrual cycle has been summarized here.A. Just after menstruation (days 3-7)Single hyperechoic thin lines (central endometrial echo)B. At the time of ovulationHalo presentRelatively thin anterior posterior endometrial thickness (<6mm)No posterior enhancementQThree line sign.Q/Trilaminar appearanceC. Luteal phaseMaximum endometrial thicknessHyperechoic endometriumLoss of haloQLoss of three line signQProminent posterior enhancementQ