Dictionary U:

ultrasonogram [also called sonogram or ultrasound]
ultrasonography
ultrasound
ultrasound test
ultraviolet radiation [also called UV radiation]
uncontrolled study
unilateral
unresectable
ureter
urethra
urinalysis
urinary
urinary tract
urine
urologist
uterine sarcoma
uterus [also called womb]
UV radiation (ultraviolet radiation)