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Truncus arteriosus
Learn more about this congenital heart defect that makes it difficult for the heart to pump the right amount of blood to the lungs and the body.
Tumor vs. cyst: What's the difference?
A Mayo Clinic expert explains the differences and similarities between these two types of growths and how doctors determine if they're cancerous.
Turner syndrome
Turner syndrome affects only females as the result of a missing or partially missing X chromosome, causing a variety of medical and developmental problems.
Umbilical cord care: Do's and don'ts for parents
Find out how to keep the area clean and dry, and when to call the doctor.
Umbilical hernia
Learn about this condition in which your intestines create a bulge near your navel.
Uncircumcised penis: Is special care needed?
Know how to wash and care for your child's uncircumcised penis.
Undescended testicle
Learn about causes, complications and treatment of this condition in which one or both testicles aren't in the usual place within the scrotum.
Unusual COVID-19 symptoms: What are they?
COVID-19 can cause a wide variety of symptoms, some more common than others. Learn about how COVID-19 can make you feel.
Ureteral obstruction
Learn about what causes blockage of the tubes that carry urine from the kidneys to the bladder, tests you might need and how the condition can be treated.
Urine cytology
A urine cytology test uses a sample of your urine to look for abnormal cells, which could indicate a urinary tract cancer.
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