What is a sonogram?

A sonogram (or ultrasound) is a test that uses high-frequency sound waves to distinguish between fluid-filled cysts (which absorb sound) and solid masses, (which reflect sound). A sonogram does not involve electromagnetic radiation (as opposed to e.g. x-rays). A sonogram is the same method employed for other tests such as imaging of a child in the womb during pregnancy.

Topic: 
Early Detection and Diagnosis