Heterogeneous Endometrium on Ultrasound
A heterogeneous endometrium on transvaginal ultrasound is a nonspecific imaging descriptor that increases concern for an endometrial structural or pathologic process rather than a uniformly homogeneous lining. [1,2] For postmenopausal bleeding, identification of an abnormal-appearing endometrium supports endometrial sampling to exclude endometrial hyperplasia or malignancy. [1]
Clinical Implications by Menopausal Status
In premenopausal patients, heterogeneous texture can be associated with benign and malignant causes of abnormal uterine bleeding, including focal lesions and hormonal endometrial changes. [2,3] In postmenopausal patients with bleeding, heterogeneous endometrium increases concern for endometrial hyperplasia or cancer, prompting histologic evaluation. [1,2]
Differential Diagnosis
Heterogeneous endometrial appearance on ultrasound can reflect endometrial polyps, endometrial hyperplasia, endometrial carcinoma, and other uterine cavity causes of abnormal bleeding. [2,3] Non-uniform endometrial echogenicity has been studied as an imaging correlate of atypical endometrial hyperplasia and carcinoma, particularly when coupled with additional risk factors. [4]
Diagnostic Evaluation Pathways
Endometrial sampling is recommended when an abnormal endometrium is identified in the setting of postmenopausal bleeding. [1] Transvaginal ultrasound is used to assess endometrial thickness and texture as part of evaluation for endometrial pathology in abnormal bleeding. [1,2] Adjunctive evaluation for focal lesions may include procedures that better delineate the endometrial cavity, such as sonohysterography or hysteroscopy, when indicated by clinical scenario and ultrasound limitations. [1,5]
Risk Stratification Factors
Age and menopausal bleeding status materially affect the likelihood that non-uniform endometrial echogenicity represents atypical hyperplasia or carcinoma. [4] In a retrospective cohort of women undergoing hysteroscopy-directed biopsy for ultrasound non-uniform endometrium, postmenopausal bleeding, endometrial thickness ≥7 mm, and age ≥50 years were associated with atypical endometrial hyperplasia or carcinoma. [4]
Treatment Implications
Management is determined by histology rather than imaging texture alone. [1,2] Benign focal causes such as polyps may be treated surgically when confirmed, while hyperplasia and carcinoma require condition-specific medical and/or surgical management based on risk category. [2,5]
Common Pitfalls to Avoid
Ultrasound endometrial texture can be nonspecific, with overlap in imaging appearances across polyps, hyperplasia, and carcinoma. [6] Endometrial thickness alone can miss some pathology, and persistent or high-risk presentations require tissue diagnosis rather than reliance on imaging reassurance. [1,6]
Practical Clinical Actions
For postmenopausal bleeding with abnormal endometrial findings on transvaginal ultrasound, endometrial sampling should be performed to exclude hyperplasia or cancer. [1] For premenopausal abnormal uterine bleeding, heterogeneous endometrium should prompt evaluation for structural and endometrial causes of bleeding, with escalation to tissue sampling when risk factors or persistence indicate. [2,3]
Safety Considerations
Heterogeneous endometrium should not be treated as a benign finding when bleeding is postmenopausal, because delayed diagnosis can occur without endometrial sampling. [1,2]
End-of-Document Clinical Focus
Heterogeneous endometrium most importantly indicates the need to exclude endometrial hyperplasia and malignancy in postmenopausal bleeding and to pursue lesion-directed evaluation in other bleeding presentations. [1,2]