Pelvic Ultrasound

A pelvic ultrasound uses sound waves to make a picture of the organs and structures in the lower belly (pelvis).

A pelvic ultrasound looks at the bladder and:

The ovaries, uterus, cervix, and fallopian tubes of a woman (female organs).
The prostate gland and seminal vesicles of a man (male organs).
Organs and structures that are solid and uniform (such as the uterus, ovaries, or prostate gland) or that are fluid-filled (such as the bladder) show up clearly on a pelvic ultrasound camera.gif. Bones or air-filled organs, such as the intestines, do not show up well on an ultrasound and may keep other organs from being seen clearly.

Pelvic ultrasound can be done three ways: transabdominal, transrectal, and transvaginal.

(Source: http://www.webmd.com/women/pelvic-ultrasound)