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Detailed information on trinucleotide repeats, including fragile X syndrome.

A child with a communication disorder has trouble communicating with others. They may not understand or make the sounds of speech. The child may also struggle with word choice, word order, or sentence structure.

A cerebral cavernous malformation (CCM) is a collection of small blood vessels (capillaries) in the central nervous system that is enlarged and irregular in structure. In CCM, the walls of the capillaries are thinner than normal, less elastic, and likely to leak. Cavernous malformations can happen anywhere in the body. They most commonly cause symptoms when they are found in the brain and spinal cord.

A developmental venous anomaly is an unusual arrangement of small veins in the brain or spinal cord. It's a condition you are born with.

Amputation is surgery to remove all or part of an arm or leg. Learn more about amputation, including why it's done, risks, and what to expect before, during, and after surgery.

Chest pain could be simple indigestion or a heart attack. Knowing the warning signs of a heart attack, and knowing how to respond, could save a life. The following guidelines can help you make the right decisions and take the right steps when seconds count.

Almost all children report having fears. Some of the most common fears are of bugs or ghosts. And studies have shown that kids are afraid of pretty much the same things no matter where they live in the world.

Detailed information on psoriasis, including causes, symptoms, diagnosis, and treatment.

Detailed information on abdominal aortic aneurysm, including causes, symptoms, diagnosis, and treatment.