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07-SEPTEMBER-2008 03:17:44 - Lesion A lesion is any abnormal tissue found on or in an organism, usually damaged by disease or trauma. Lesion is derived from the Latin word laesio which means injury. Contents 1 Causes of lesions 2 Types of lesions 3 See also 4 External links 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 tumor is also a lesion. Trauma, including electrocution and chemical burns can also 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. Lesions are sometimes intentionally inflicted during neurosurgery, such as the carefully-placed brain lesion used to treat epilepsy and other brain disorders. 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. Lesions may be classified by the shape they form, as is the case with many ulcers, which can have a bullseye or 'target' appearance. Their size may be specified as gross or histologic depending on whether they are visible to the unaided eye or require a microscope to see. 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 VZV infection are called chickenpox. Lesions of the teeth are usually called dental caries. Finally, lesions are often classified by their location. For example, compare a 'skin lesion' versus a 'brain lesion'. See also Ablation External links Brain Lesion Locator Differential Diagnosis of Brain Lesions Retrieved from http://en..org/wiki/Lesion Categories: Pathology Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages Deutsch Español Français Bahasa Indonesia Italiano Magyar Norsk bokmål Português Svenska ไทย This page was last modified on 6 July 2008, at 10:45
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