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Leukemia is a type of blood cancer. It develops in the bone marrow and is the most common form of cancer in children.

Liposarcoma is a malignant soft tissue tumor that develops in fat tissue.

Large cell lymphoma is a type of non-Hodgkin lymphoma.

A laryngeal cleft (or laryngotracheal cleft) is an abnormal opening between the larynx and the esophagus.

Liver failure is the severe decline of liver function.

The liver, the largest organ in your body, can be injured by landing or being hit on the right chest or upper abdomen.

Loeys-Dietz syndrome is a rare, genetic condition that affects the formation of a child’s connective tissue.

Long QT Syndrome (LQTS) is an inherited condition that affects the heart’s electrical rhythm and can cause fast, erratic heartbeats.

Little League shoulder happens when an athlete throws too often or repeatedly throws the wrong way and hurts his shoulder.

A birthweight less than 5 pounds, 8 ounces, is diagnosed as low birthweight.