[Transvaginal ultrasonographic monitoring on the morphological changes of ovary and endometrium during normal menstrual cycle].

The morphological changes of ovary and endometrium were assessed by transvaginal ultrasonography in 35 normal menstrual cycles in the early-follicular phase, late-follicular phase and luteal phase. Serum estradiol and progesterone level were determined at the same time. The mean volume of ovulatory ovary was 95.19 +/- 40.97mm3, the mean major diameter (length) was 32.44 +/- 4.29 mm and the mean minor diameter (width) was 22.92 +/- 4.23 mm just before ovulation. The difference was significant as compared with early-follicular phase (P < 0.01). There were almost no changes of volume and length of the nonovulatory ovary through the 3 phases. The number of follicles of each ovary on two sides was not different in 3 phases. The mean number of follicles of each ovary was 6.85 +/- 1.87. The mean diameter of the dominant follicle increased by 1.3 +/- 0.5 mm each day, one day before ovulation the mean diameter increased to 19.75 +/- 4.81 mm, the mean volume increased to 35.5 +/- 2.7 mm3 one day before ovulation. The thickness of endometrium increased every day in the follicular phase, and was positively correlated with E2 level. No significant changes in thickness but some changes in ultrasonic texture of endometrium in luteal phase were noticed nics.