Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «L»:
Living will: A living will is one form of advance
medical directive. Advance medical directives pertain to
treatment preferences and the designation of a surrogate
decision-maker in the event that a person should become unable to
make medical decisions on their own behalf.
Advance directives ge...
Lizard bite: Only two types of lizards are poisonous: the Gila monster that lives in Arizona and Mexico and the beaded lizard of Mexico. Symptoms from their bites of these include pain, swelling, and discoloration in the area around the bite and swollen lymph nodes. Weakness, sweating, thirst, heada...
LKS: Landau-Kleffner syndrome....
LL: 1. Lower lid (of the eye).
2. Lower limit. The recommended LL for potassium intake is 4.7 grams per day for adults....
LLL: Acronym for the left lower lobe (of the lung).
The left lung has but two lobes. The other lobe is the left upper lobe (LUL).
The right lung has three lobes: the right lower lobe (RLL), the right middle lobe (RML), and the right upper lobe (RUL).
The reason why the right lung has three lobes wh...
LLQ: Abbreviation for the
left lower quadrant (quarter). The LLQ of the abdomen contains the descending portion of the colon.
(By contrast, RUQ stands for the right upper quadrant,
LUQ stands for the left upper quadrant, and RLQ stands for the right lower quadrant.)...
LMP: Abbreviation for "last menstrual period."
By convention, pregnancies are dated in weeks starting from the first day of a woman's last menstrual period (LMP). If her menstrual periods are regular and ovulation occurs on day 14 of her cycle, conception takes place about 2 weeks after her LMP. A w...
LN2: Liquid nitrogen....
Loa loa: The eye worm, a parasite that lives in humans and other primates. People contract the parasite when bitten by infected deer flies. The larvae of the worm enter the bloodstream and later develop into adult worms. Symptoms may not appear for months or years after the bite of the fly. The worm...
Lobar: Having to do with a lobe. For example, lobar pneumonia.
Lobe: Part of an organ that appears to be separate in some way from the rest. A lobe may be demarcated from the rest of the organ by a fissure (crack), sulcus (groove), connective tissue or simply by its shape. For example, there are the frontal, parietal, temporal, and occipital lobes of the brain....
Lobectomy: An operation done to remove a lobe of an organ such as the lobe of a lung or a lobe of the thyroid gland.
The lung has 5 lobes -- 3 on the right and 2 on the left. A lobectomy may be performed for a disease such as lung cancer....
Lobotomy: A neurosurgical procedure performed in the past that involved severing the nerve fibers that connect the prefrontal cortex (the anterior and frontal lobes of the brain) to other parts of the brain. The procedure was developed in the late 1930s and was widely performed beginning in the 1940...
Lobstein's disease: Osteogenesis
imperfecta type I. An inherited, generalized connective
tissue disorder featuring bone fragility and blue sclerae
(blue whites of the eyes). The classic mild form of
"brittle bone disease." It is a dominant trait with males
and females affected. One copy of th...
Lobular carcinoma of the breast, infiltrating
Lobular carcinoma of the breast, infiltrating: Infiltrating lobular carcinoma is the second most common type of invasive breast cancer next to infiltrating ductal carcinoma, accounting for 5 to 10% of breast cancer.
Infiltrating lobular carcinoma starts in the lobules, the glands that secrete milk,...