A lesion is a non-specific term referring to abnormal tissue in the body. It can be caused by any disease process including trauma (physical, chemical, electrical), infection, neoplasm, metabolic and autoimmune.

Cause and treatment

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Lesions can also be inflicted intentionally during surgery, for example to specific regions of the brain to treat epilepsy. Thus a lesion can mean inflicting damage to an area of the brain i.e. by burning or cutting, in order to study the effects of disabling this area of the brain.

Not all lesions require treatment.

Lesion is derived from a Latin word which means "injury."

Medical terms

Läsion | Lesión | Lésion (médecine) | Lesão | Lesion