Can transvaginal ultrasound be used for early detection of ovarian cancer?

Sometimes: It is not a good screening test for the average woman. However, some centers recommend aggressive screening for women with significant family history of ovarian cancer or genetic related issues. In those few cases, screening with vaginal ultrasound and ca-125 blood tests may be helpful. (but unfortunately, these tests are no where near as sensitive as colonoscopy screening for colorectal polyps.

Yes: It can be used for early detection, but sometimes finds things that are not cancerous, or even dangerous. This can lead to more, and sometimes more invasive, testing.

Not recommended: In 2012, the uspstf reaffirmed it's recommendation against screening for ovarian cancer with blood testing or ultrasound as neither have been shown in studies to reduce the number of ovarian cancer deaths. In fact, screening leads to important harms in women who undergo unnecessary surgical procedures for benign findings. Us can identify suspicious ovarian masses in symptomatic women.