Can endometrial cancer be detected on a sonogram or mri?

Yes: Many times however endometrial biopsy or sonohysterography are necessary, .

Ultrasound.: Transvaginal ultrasound to evaluate the endometrial thickness in women with postmenopausal bleeding is increasingly used to detect endometrial cancer. Hysteroscopy can be used to directly visualize the uterine cavity, including tumors, and makes possible cell samples with minimal damage to the endometrium.

Yes, both: Pelvic ultrasound is by far the most common way to evaluate the endometrium. Mri can also evaluate the endometrium but is a much more involved and expensive test.

Endometrial cancer: Endometrial cancer can be suspected but not definitively diagnosed on ultrasound (sonogram) or mri.