Detection of Uterine Cancer on Pelvic Ultrasound

Ultrasound Capabilities for Uterine Cancer Detection

Transvaginal ultrasound (TVUS) is the first-line imaging modality for evaluating abnormal uterine bleeding and can identify suspicious endometrial findings that may suggest uterine cancer 1, 2
TVUS can display endometrial abnormalities and evaluate endometrial thickness, which may indicate potential malignancy when thickened 3
MRI demonstrates superior capabilities for identifying malignant uterine pathology with sensitivity and specificity up to 79% and 89% respectively for endometrial cancer, compared to ultrasound's more limited capabilities 1, 5

Ultrasound cannot definitively distinguish between benign endometrial pathology and endometrial cancer with high certainty 1, 5

For postmenopausal women, an endometrial thickness ≤4 mm has a negative predictive value for endometrial cancer of nearly 100%, while thickness ≥5 mm generally requires endometrial tissue sampling 4, 6
When ultrasound findings are suspicious or inconclusive, endometrial sampling or direct visualization with hysteroscopy is recommended for definitive diagnosis 1, 2
The American College of Radiology recommends a combined transabdominal and transvaginal approach for complete assessment of pelvic structures when evaluating for potential uterine pathology 3, 4

Color Doppler evaluation can help identify vessels within endometrial lesions, which may suggest polyps or cancer, though it cannot definitively differentiate between benign and malignant conditions 2, 3
Sonohysterography (saline infusion into the uterine cavity during ultrasound) can better characterize focal endometrial abnormalities but still cannot reliably distinguish between benign pathology and cancer 1, 5
MRI is superior for identifying malignant uterine pathology and can display the endometrium even when obscured by leiomyomas or adenomyosis on ultrasound 1, 2

Relying solely on endometrial thickness measurement without tissue sampling when thickness exceeds normal thresholds 6