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I reviewed your query and here is advise.
The differential diagnosis is done with
Non-
pregnancy related
*endometrial carcinoma: variable appearance
*endometrial hyperplasia: usually uniformly hyperechoic and tends to be diffuse. Can be a differential diagnosis of many conditions i.e. PCOS
*endometrial polyp: usually hyperechoic, often focal, look for vascular stalk
*Tamoxifen-related endometrial changes: variable appearances
*
hormone replacement therapy (HRT): in postmenopausal female
*endometritis: prominent hyperechoic endometrium +/- fluid and debris
adhesions: irregular echogenic areas with focal thickening
*obstructed outlet
*ovarian tumours associated with endometrial thickening
*endometrioid carcinoma of the ovary
granulosa cell ovarian cancer
I think it may be hormone related and PCOS.
Also check
thyroid hormone levels.
Hope I have answered the question.
Let me know if I can assist you further.