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Aniridia is a serious and rare eye disorder in which the iris is partly or completely gone.

Aortic valve regurgitation is when a person's aortic valve leaks. The aortic valve is 1 of the heart's 4 valves. These valves help the blood flow through the heart and out to the body. Normally, the aortic valve stops blood from flowing back into the left ventricle. With aortic valve regurgitation, some blood leaks back through the valve as the heart relaxes.

Arrhythmogenic right ventricular cardiomyopathy (ARVC) is a disease of the heart muscle. In this disease, fatty fibrous tissue replaces normal heart muscle. This interrupts normal electrical signals in the heart and may cause irregular and potentially life-threatening heart rhythms. The heart also becomes weaker over time leading to heart failure.

Bacterial endocarditis is a bacterial infection of the inner layer of the heart or the heart valves. Read on to learn about the cause, symptoms, diagnosis, and treatment.

Behcet disease is a type of autoimmune disease. It causes inflammation of blood vessels. It’s a rare disease in the United States, but it is more common in the Middle East and Asia. It’s more common in people in their 20s to 40s, but it can happen at any age.

A brain cyst is a fluid-filled sac in the brain. They can be noncancer (benign) or cancer (malignant).

Brown syndrome is a rare disorder that limits the eye's normal movements. Here's what you need to know.

Carnitine palmitoyltransferase (CPT) deficiency is a very rare condition that causes muscle weakness and other symptoms. It happens because of a problem with one of two enzymes, CPT1 or CPT2. Enzymes are substances in the body that help cause chemical reactions.

A carotid dissection is a type of tear in 1 of your carotid arteries. It is a common cause of stroke in people younger than age 50.