Sonographic morphology of the normal menstrual cycle

Area of Science:

• Reproductive endocrinology
• Diagnostic medical sonography

Background:

• Gynecologic sonography is essential for evaluating the female reproductive system.
• Understanding normal physiological changes during the menstrual cycle is critical for accurate interpretation.

Purpose of the Study:

• To correlate hormonal and physical parameters of an ovulatory cycle with sonographic morphological changes.
• To identify sonographic markers of normal ovarian and uterine physiology.

Main Methods:

• Sequential gray-scale sonograms were performed during 20 menstrual cycles in 16 healthy female volunteers.
• Hormonal and physical parameters were monitored throughout the cycles.
• Sonographic findings of ovaries, uterus, and cul-de-sac were correlated with physiological data.

Main Results:

• Ovarian cysts corresponding to Graafian follicles and corpora lutea were observed.
• Small amounts of free pelvic fluid were detected at ovulation.
• A characteristic uterine appearance was noted prior to menstruation, linked to hormonal influences.

Conclusions:

• Sonographic visualization of ovarian follicles and corpora lutea reflects normal reproductive physiology.
• The presence of free pelvic fluid at ovulation is a normal finding.
• Hormonal effects on the uterus create a distinct premenstrual sonographic appearance.
• Accurate interpretation of gynecologic sonograms requires knowledge of normal physiological variations.