Glossary Section U through Z

Letter U Section

Ultrasonography

A test in which sound waves are bounced off tissues and the echoes are converted into a picture (a sonogram). These pictures are shown on a monitor that's similar to a TV screen. Tissues of different densities vary in the picture because they reflect sound waves differently. A sonogram can show whether a breast lump is a fluid-filled cyst or a solid mass.

Letter W Section

Letter X, Y, Z Section

X-ray