Endometrial Thickness in Adolescents

Normal Endometrial Thickness

In premenopausal women, including adolescents, endometrial thickness fluctuates normally throughout the menstrual cycle due to hormonal changes 1
Unlike in postmenopausal women, there is no absolute upper limit for normal endometrial thickness in premenopausal individuals 1

The American College of Radiology recommends that transvaginal ultrasound combined with transabdominal approach provides the most comprehensive evaluation of endometrial thickness 2, 1
Color and spectral Doppler should be used to evaluate internal vascularity patterns when available 2, 1

Abnormal echogenicity or texture of the endometrium may correlate with underlying pathology regardless of thickness 1
If focal abnormalities are suspected within the endometrium, sonohysterography might be considered for further characterization 1

The American College of Radiology notes that an endometrial thickness of 6.6 mm in postmenopausal women would exceed the 5 mm threshold that generally prompts endometrial sampling 1
The negative predictive value for endometrial cancer approaches 100% when the endometrium measures ≤4 mm in postmenopausal women 1

The American College of Radiology recommends that transvaginal ultrasound provides better resolution but may not be appropriate as first-line imaging in adolescents; transabdominal approach may be preferred initially 2
When evaluating endometrial thickness in adolescents, the entire uterus should be imaged to rule out other pathologies 3
Doppler evaluation improves specificity when assessing endometrial vascularity patterns 4
Pitfalls in assessment include variations in measurement technique and differences in endometrial appearance throughout the menstrual cycle 4