A pericardial window is a surgery done on the sac around the heart. A small part of the sac is removed to let extra fluid drain from the sac.

Viscosupplementation is a treatment that can help ease arthritis symptoms. It's done by injecting hyaluronic acid into a joint. It's most often done in the knee. It can help reduce pain and swelling.

Aniridia means lack of an iris. It is a rare disorder in which the iris of the eye is partly or completely missing.

Diabetic ketoacidosis (DKA) is a serious problem that can happen in people with diabetes. If you have the symptoms of DKA, get medical help right away.

A vagus nerve stimulator (VNS) is a device that can help prevent seizures. It can also treat depression. Read on to learn more about how this device works.

Varicocele embolization is a procedure to treat an enlarged vein in the scrotum. Varicoceles often form during puberty. Learn about how the procedure is done.

Nasal polyps are abnormal, soft growths in the nose or sinuses. Read on to learn more.

Meniscal transplant surgery is a surgery to replace a small piece of missing or damaged cartilage in the knee. The meniscus is replaced with one from a cadaver donor.

A Meckel's scan is an imaging test used to detect a Meckel's diverticulum. This is a small, abnormal pocket in the wall of a child's large intestine.

A Lisfranc joint injury is a kind of injury to the bones or ligaments in the arch of your foot. The injury gets its name from a French surgeon.