Conditions & Treatments


Lactose intolerance is a condition caused by a lack of an enzyme called lactase, which, in turn, causes the body to be unable to digest lactose, a sugar found in milk and milk products.


Landau-Kleffner syndrome (also called infantile acquired aphasia, acquired epileptic aphasia or aphasia with convulsive disorder) is a language disorder characterized by the gradual or sudden loss of the ability to use or comprehend spoken language.


Laryngeal cancer includes cancerous cells found in any part of the larynx - the glottis, the supraglottis, or the subglottis.


Lateral epicondylitis, also known as tennis elbow, is characterized by pain in the back side of the elbow and forearm, along the thumb side when the arm is alongside the body with the thumb turned away. The pain is caused by damage to the tendons that bend the wrist backward away from the palm.


Some children and adults have an allergy or sensitivity to latex (rubber). Reactions can be seen when products made from latex come in contact with the person's skin, mucous membranes (like the mouth, genitals, bladder or rectum), or the bloodstream (during surgery).


Legg-Calvé-Perthes disease (or Perthes disease) is a temporary condition in children in which the ball-shaped head of the thigh bone, referred to as the femoral head, loses its blood supply. As a result, the femoral head collapses.


Leukemia is cancer of the blood cells, usually the white blood cells. Leukemic cells look different than normal cells and do not function properly.


The risk for breast cancer and many other forms of cancer is increased with Li-Fraumeni syndrome (LFS), a genetic autosomal dominant cancer syndrome.


Ligament injuries to the knee include injuries to one of the four knee ligaments (elastic bands of tissue that connect bones to each other).


Tumors are abnormal masses of tissue that form when cells begin to reproduce at an increased rate. The liver can grow both non-cancerous (benign) and cancerous (malignant) tumors.


A spine affected by lordosis shows evidence of a curvature of the back bones in the lower back area, giving the child a "swayback" appearance.


Low back pain can range from mild, dull, annoying pain, to persistent, severe, disabling pain in the lower back. Pain in the lower back can restrict mobility and interfere with normal functioning.


Lumbar disc disease occurs in the lumbar area of the spine. As discs degenerate, fragments of the disc material can press on the nerve roots located just behind the disc space, causing pain, numbness or changes in sensation.


A lumbar strain is an injury to the lower back, which results in damaged tendons and muscles that spasm and feel sore.


Lung cancer is cancer that usually starts in the lining of the bronchi (the main airways of the lungs), but can also begin in other areas of the respiratory system, including the trachea, bronchioles, or alveoli.


While most tick bites are harmless, several species can cause life-threatening diseases. Two of these well-known diseases are Rocky Mountain Spotted Fever and Lyme disease.


Lymphadenopathy is the term for swelling of the lymph nodes - the bean-shaped organs found in the underarm, groin, neck, chest, and abdomen that act as filters for the lymph fluid as it circulates through the body.


A lymphatic malformation is a mass in the head or neck that results from an abnormal formation of lymphatic vessels. Lymphatic malformations are sometimes seen in children with certain chromosome abnormalities and genetic conditions.


When the normal drainage pattern in the lymph nodes is disturbed or damaged (such as during radiation or during surgery to remove lymph nodes), this may cause an abnormal collection of fluid that causes the arm to swell.