Ultrasound

Visualization of structures in the body by recording the reflections of sound waves directed into tissues. May be used during surgery. Also called ultrasound scanning or sonography, uses high-frequency sound waves to obtain images inside the body. Neurosonography...

Undifferentiated

An immature, embryonic, or primitive cell. It has a nonspecific appearance with multiple nonspecific activities and functions poorly. See differentiate, dedifferentiate. In cancer, refers to how mature (developed) the cancer cells are in a tumor. Differentiated tumor...

Uterus

The hollow muscular organ in which the impregnated ovum (egg) is developed into an infant. The uterus is about 7.5 cm in length in the nonpregnant woman, and consists of a main portion (body) with an elongated lower part (neck), at the extremity of which is the...