Fig. 1
From: The role of transvaginal ultrasound in the management of abnormal uterine bleeding
Sagittal transvaginal image of a retoverted uterus with a periovulatory endometrial pattern. The dotted line indicates the endometrial thickness. A three-layer endometrium is noted: the endometrial lumen is demonstrated by the central echogenic line, the hypoechogenic layer representing the edematous endometrial functionalis and an outer echogenic area representing the endometrium basalis