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Cholesterol is a waxy, fatlike substance that can be found all over the body. LDL, HDL, and triglycerides are types of cholesterol.

“Learning disorder” and “specific learning disability” refer to a neurodevelopmental problem in which a child of normal intellectual potential is encountering unusual difficulty with their academic functioning that cannot be...

A limb-length discrepancy is when one leg or arm is shorter than the other leg or arm.

Legg-Calve-Perthes disease (aka Perthes disease) happens when the ball-shaped head of the thighbone temporarily loses its blood supply.

Leiomyosarcoma is a cancer of the muscle, particularly of soft tissue.

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.