FACTOID # 21: 15% of Army recruits from South Dakota are Native American, which is roughly the same percentage for female Army recruits in the state.
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Encyclopedia > Lesion
Skin lesions caused by Chickenpox
Skin lesions caused by Chickenpox

A lesion is any abnormal tissue found on or in an organism, usually damaged by disease or trauma. Image File history File linksMetadata Download high resolution version (904x947, 74 KB) Summary Child with varicella disease (chickenpox). ... Image File history File linksMetadata Download high resolution version (904x947, 74 KB) Summary Child with varicella disease (chickenpox). ... Biological tissue is a collection of interconnected cells that perform a similar function within an organism. ...

Causes of lesions

Lesions are caused by any process that damages tissues. A cancerous tumor is an example of a lesion, however the surrounding tissue damaged by a tumour is also a lesion. Trauma, including electrocution and chemical burns cause lesions. Certain diseases present lesions, for example the skin deformities caused by chicken pox. Lesions can also be caused by metabolic processes, like an ulcer or autoimmune activity, as in the case with many forms of arthritis. Tumor or tumour literally means swelling, and is sometimes still used with that meaning. ... In medicine, a trauma patient has suffered serious and life-threatening physical injury resulting in secondary complications such as shock, respiratory failure and death. ... Chicken pox, also spelled chickenpox, is a common childhood disease caused by the varicella_zoster virus (VZV), also known as human herpes virus 3 (HHV_3), one of the eight herpesviruses known to affect humans. ... Endoscopic images of a duodenal ulcer. ... Autoimmune diseases arise from an overactive immune response of the body against substances and tissues normally present in the body. ... Arthritis (from Greek arthro-, joint + -itis, inflammation; plural: arthritides) is a group of conditions where there is damage caused to the joints of the body. ...

Lesions are sometimes intentionally inflicted during surgery, such as the carefully-placed brain lesion used to treat epilepsy and other brain disorders. A cardiothoracic surgeon performs a mitral valve replacement at the Fitzsimons Army Medical Center. ...

Note that lesions are not limited to animals or humans; damaged plants are said to have lesions.

Types of lesions

Because the definition of lesion is so broad, the varieties of lesions are virtually endless. They are subsequently classified by their features. If a lesion is caused by cancer it will be classified as malignant versus benign. They may be classified by the shape they form, as is the case with many ulcers which appear like as a bullseye or 'target'. Their size may be specified as gross or histologic depending on if they are visible to the unaided eye or if they require a microscope to see. Cancer is a class of diseases or disorders characterized by uncontrolled division of cells and the ability of these to spread, either by direct growth into adjacent tissue through invasion, or by implantation into distant sites by metastasis (where cancer cells are transported through the bloodstream or lymphatic system). ... An ulcer (from Latin ulcus) is an open sore of the skin, eyes or mucous membrane, often caused by an initial abrasion and generally maintained by an inflammation and/or an infection. ... A bullseye on a dartboard. ...

An additional classification that is sometimes used is based on whether or not a lesion occupies space. A space occupying lesion, as the name suggests, occupies space and may impinge on nearby structures, whereas a non space occupying lesion is simply a hole in the tissue, e.g. a small area of the brain that has turned to fluid following a stroke.

Some lesions have specialized names, like the Gohn lesions in the lungs of tuberculosis victims. The characteristic skin lesions of a varicella-zoster virus infection are called chickenpox. Lesion of the teeth are usually called Dental caries. Tuberculosis (abbreviated as TB for Tubercle Bacillus) is a common and deadly infectious disease that is caused by mycobacteria, primarily Mycobacterium tuberculosis. ... The varicella-zoster virus (VZV), also known as human herpesvirus 3 (HHV-3), is one of the eight herpesviruses known to affect humans (and other vertebrates). ...

Finally, they are often classified by their location. For example, compare a 'skin lesion' versus a 'brain lesion'.

Lesion is derived from the Latin word "laesio" which means "injury." Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ...

See also

  Results from FactBites:
Lesion - Wikipedia, the free encyclopedia (123 words)
A lesion is a non-specific term referring to abnormal tissue in the body.
Lesions can also be inflicted intentionally during surgery, for example to specific regions of the brain to treat epilepsy.
Lesion is derived from a Latin word which means "injury."
lesion - Search Results - MSN Encarta (128 words)
A lesion is a wound or area of damage.
Researchers using lesion methods damage, destroy, or remove a particular part of a laboratory animal’s brain....
After a person is infected with the smallpox virus, about 12 days pass before the person begins to feel sick, a time known as the incubation period....
  More results at FactBites »



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