Can you see the B's superpowers?

Cervical erosion do B ultrasound is not seen, because do gynecological B ultrasound time is the need to hold urine, that is, after the bladder filling, because the urine in the bladder is anechoic area, you can show the uterus and accessories. Do B ultrasound time can see the uterus, ovary and fallopian tube is not normal, there is no tumor. But the cervix in the vagina, bladder filling after also can not see the cervix, so cervical erosion B ultrasound is not seen, cervical tumor or cervical polyps, are also not seen. only when doing gynecological examination can we see that there is no cervical tumor, there is no erosion-like change or there is no cervical polyps.