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laparoscopy [lap-a-ros-co-py], laparoscope [lap-a-ro-scope]
The process of looking into the abdomen using a laparoscope
in order to establish a diagnosis,
particularly of liver, bowel and pelvic conditions:
see endoscopy, fibre optics.
large bowel
Consists of the colon and rectum: see bowel, Diagram 1. Also called large intestine.
large cell carcinoma
A type of lung
cancer that usually develops in the airways and is characterised
by large rounded cells.
It accounts for about 16 per cent of all lung cancers.
laryngeal carcinoma [la-ryn-ge-al
car-ci-no-ma]
Cancer of the larynx. This
is considerably more common in men than in women. Most cancers
of the larynx occur on the vocal
cords; hoarseness is an early symptom. Many can be cured if
diagnosed at an early stage: see laryngectomy.
laryngectomy [la-ryn-gec-to-my]
A total laryngectomy is the surgical removal of the larynx or voice
box. A partial laryngectomy is the removal of part of the
larynx: the voice is preserved, though it may be slightly changed.
larynx [la-rynx]
The voice
box, or Adam's apple, which sits in the front of the neck.
It contains the vocal
cords. During swallowing, the vocal cords close together to
prevent food and saliva entering the windpipe. They also vibrate
together to produce voice. See Diagram
2.
laser
An instrument that produces an intense beam of light
used in surgical procedures. It can work on a very small area
with great precision without damaging surrounding tissue. It can
be used to remove abnormal cells.
lesion [le-sion]
Any abnormality in tissues of the body caused by disease
or injury.
leucocyte (or leukocyte) [leu-co-cyte]
see white
blood cell.
leukaemia [leu-kae-mi-a]
Cancer that affects the bone
marrow and organs that manufacture blood (lymph nodes,
spleen). In leukaemia, large numbers of abnormal white blood cells
(known as leukaemic blasts) are produced, and this suppresses
the production of normal blood
cells. Leukaemia may be acute,
progressing rapidly over days or weeks, or chronic,
progressing slowly over months or years: see white
blood cells.
lipoma [lip-o-ma]
A soft, fatty benign tumour (not a cancer)
that lies directly under the skin.
Lipomas may be very small or as big as a grapefruit, and are very
common. They are sometimes removed for cosmetic reasons.
liposarcoma [lip-o sar-co-ma]
A cancer that forms in fat cells,
liposarcomas are common in soft tissue - most commonly the thigh
- but rare in bone. It rarely occurs in people under the age of
thirty.
liver
A large organ in the upper right side of the abdomen, directly under the diaphragm.
It is made up of four connected lobes,
and weighs up to about 1.6 kg. Among its many functions are breaking
down old red
blood cells to form bile, producing proteins needed for blood clotting, regulating the level of many hormones,
storing sugar and regulating the amount of sugar in the blood,
storing vitamins A, B12, D and K, and storing and metabolising
fats. See Diagram 1.
liver cancer
Cancer that begins in the liver is uncommon in Australia. Treatment may be surgery and/or chemotherapy.
However it is common to find secondary
tumours (metastases)
in the liver, that is, cancers that have spread to the liver from
another part of the body. These 'liver secondaries' are not true
liver cancers, and treatment will depend on the site and type
of the primary or original cancer.
liver function tests
A simple blood test that gives information about how
the liver is functioning.
liver scan
A test used to discover the size, shape and position
of the liver and to
detect any tumours:
see nuclear
medicine.
lobe
A major division of an organ of the body, often separated from other lobes by deep splits.
The liver is made
up of four lobes, the right lung has three lobes, and the left
lung, two.
lobectomy [lo-bec-to-my]
The surgical removal of a lobe of the liver or a
lung.
lobular cancer [lob-u-lar can-cer]
A breast
cancer that starts in the milk sacs in one of the lobes of the breast.
local excision
The surgical removal of a localised cancer,
that is, one that has not spread beyond its original site: see lumpectomy.
local invasion
see infiltration.
localised
prostate cancer
Cancer which
is confined to the prostate, and has not spread away from the
prostate. Also called early prostate cancer.
local recurrence
see recurrence.
lumbar puncture
A diagnostic test in which a sample of cerebrospinal
fluid is taken from the area around the spinal cord and examined
under the microscope. The fluid may show evidence of tumour,
infection, or inflammation in the central
nervous system.
lumbar spine
The section of backbone in the small of the back, just
above the buttocks.
lumpectomy [lump-ec-to-my]
The surgical removal of a lump, particularly in relation
to breast cancer to describe the removal of a breast lump with some of the surrounding
healthy tissue, without removing the whole breast:
see local excision.
lumpy breast disease
see benign
fibrocystic changes.
lungs
The two sponge-like, pinkish-grey organs in the chest cavity. The lungs wrap around the heart and the oesophagus.
Air enters the lungs via the windpipe. Oxygen processed from this
air passes into the bloodstream. See Diagram
2.
lung cancer
Cancer that starts in the lung or in the lining of the air passages leading
to the lung. There are several different types of lung cancer
that are named according to the type of cell involved. Lung cancer is the fourth most common cancer in Victoria.
lung function tests
see pulmonary
function tests.
lymph
A clear fluid that contains white
blood cells, antibodies, and wastes carried from the body
tissues, lymph is present throughout the body in a network of
lymphatic vessels.
lymph glands
see lymph
nodes.
lymph nodes
Small bean-shaped structures scattered along the lymphatic
vessels, particularly in the neck, armpit and groin. They filter
the lymph to remove bacteria and other harmful agents to prevent them from entering the bloodstream.
Lymph nodes also produce lymphocytes, a type of white
blood cell. Also called lymph glands (although they are not
true glands). Lymph
node negative test results show no cancer cells in the lymph nodes. Lymph node positive test results show
that cancer cells are present in the lymph nodes.
lymph tissue
see lymphoid
tissue.
lymphatic system, lymphatic vessels
The lymphatic system is part of the immune system, which
protects the body against 'invaders', like bacteria and parasites.
The lymphatic system is a network of small lymph nodes connected
by very thin lymph vessels, which branch into every part of the
body.
lymphocyte
A type of white blood cell formed in lymph nodes. It
is part of the body's immune system which helps to fight infection.
lymphoedema [lymph-oe-de-ma]
Swelling caused by a buildup of lymph;
this happens when there is a insufficient draining in lymphatic
vessels or lymph
nodes, and can occur following some cancer treatments.
lymphoid tissue [lym-phoid]
Tissue where lymphocytes and antibodies are made. The lymph nodes,
tonsils, thymus and
spleen are made up of lymph tissue; it also forms part of other
tissues. It is important in fighting infection. Also called lymph
tissue.
lymphoma [lym-pho-ma]
Lymphomas are divided into two major types: Hodgkin's
disease and non-Hodgkin's
lymphoma. Most arise in a lymph
node, but sometimes a non-Hodgkin's lymphoma may begin in lymph tissue in the stomach,
bone or small
intestine. Some non-Hodgkin's lymphomas tend to appear simultaneously
in several parts of the body.
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