Also known as “synechia vulvae” or “labial agglutination,” a closure of the opening to the vagina, may occur in the first few months of life or, even more rarely, at a later time.

A condition in which a lack of an enzyme called lactase causes the inability to digest lactose, a sugar found in milk products.

A laryngeal cleft is a gap in the tissues at the back of the voice box, which sometimes extends further down into the tissues that separate the windpipe and esophagus.

Children can be born with a laryngeal web, or it can be acquired as a scar between the vocal cords where they meet.

Laryngomalacia is a malformation of the top of the voice box at birth, which causes floppiness of the upper airway above the vocal cords.

A condition involving the bones of the hip joint, when there is not enough blood delivered to the femoral head, the round ball at the top of the thighbone (femur).

Cancer of the blood, beginning in the bone marrow, the soft, spongy center of the long bones that produces the three major blood cells: white, red, and platelets.

A group of disorders that damage the covering of the nerve cells in the brain and spinal column, so they can no longer transmit signals between the brain and the body.

Lurie Children's Leukodystrophy Care Program is a multidisciplinary program providing the best possible comprehensive care to patients with leukodystrophies and their families at every stage of their disease.

Lip tie occurs when a piece of tissue (a frenulum) behind the upper lip is short and tight. Learn more.

Irritation and inflammation of the growth plate on the inner side of the elbow, occurring in young baseball players and in other sports where players throw often.

Irritation and inflammation of the growth plate in the upper arm bone, occurring most often in pitchers and other athletes who do repetitive overhead movements with their arms.