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A mitral valve replacement is a surgery to replace a mitral valve that doesn't work well. It's replaced with a new valve.

A brain cyst is an abnormal fluid-filled sac in the brain. A cyst may contain blood, pus, or other material. In the brain, a cyst may contain cerebrospinal fluid (CSF). CSF normally bathes and cushions the brain and spinal cord. Often, a brain cyst begins before birth.

Carnitine is a nutrient that helps the body's cells work normally. Primary carnitine deficiency is when not enough carnitine can get into cells in the body. It is a rare health problem a child is born with. Learn more about it, including the causes, symptoms, diagnosis, and treatment.

A colloid cyst is a type of brain cyst. The cyst usually contains a thick gel-like substance called colloid. A colloid cyst is generally benign (not cancer).

A dermoid cyst is the growth of normal tissue in an abnormal place in the body. The cyst is benign (not cancer). It contains different types of tissue, such as hair follicles, cartilage, sweat glands, and glands that make skin oils. A dermoid cyst in the brain or spinal cord is a rare type.

An epidermoid cyst is the growth of normal tissue in an abnormal place in the body. It contains skin and nail tissue. An epidermoid cyst is also called an epidermoid tumor. The cyst is not cancer (benign). But in rare cases, an epidermoid cyst may turn into skin cancer.

A pineal is a type of brain cyst. They are generally not cancer (benign). Read on to learn about symptoms, diagnosis, and treatment.

Choroid plexus papilloma (CPP) is a rare type of brain tumor. It is generally benign (not cancer). Benign also means that the growth does not spread to other parts of the body. CPP are generally slow-growing tumors. It is very rare for this type of tumor to spread outside the brain.

A gastrointestinal stromal tumor is a rare type of cancer. It occurs in the gastrointestinal or digestive tract.