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Atrioventricular canal defect
This congenital heart defect involves a hole in the heart. It affects blood flow through the heart valves. Learn the symptoms and how it's treated.
Atypical genitalia
In this rare condition, a baby's genitals are not clearly male or female. Genitals may not be fully developed or the baby may have features of more than one sex.
Atypical hyperplasia of the breast
Learn how a diagnosis of atypical lobular hyperplasia or atypical ductal hyperplasia affects your risk of breast cancer and what you can do.
Baby acne
Baby acne — Comprehensive overview covers causes, symptoms, treatment of this newborn complexion problem.
Bacterial vaginosis
Learn about symptoms, treatments and prevention of this common vaginal condition.
Bartholin's cyst
A Bartholin's cyst is a fluid-filled lump near the vaginal opening. It's rarely serious, but when infected, it can be painful.
Benign prostatic hyperplasia (BPH)
This common problem, also known as an enlarged prostate, can be treated.
Bicuspid aortic valve
This condition, present at birth, affects the valve between the lower left heart chamber and the body's main artery. Know the symptoms and treatment.
Bladder cancer
Blood in the urine (hematuria) sometimes is a sign of bladder cancer. Learn about other bladder cancer signs and symptoms and explore treatment options.
Bladder exstrophy
This rare birth defect occurs when the bladder develops outside the fetus during pregnancy. The condition can be repaired with surgery.
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