An all-encompassing term for any abnormality of structure or function in any part of the body. The term may refer to a wound, infection, tumour, abscess, or chemical abnormality.
Lesion meant originally an injury, but is now applied generally to all disease changes in organs and tissues.
n. a zone of tissue with impaired function as a result of damage by disease or wounding. Apart from direct physical injury, examples of primary lesions include abscesses, ulcers, and tumours; secondary lesions (such as crusts and scars) are derived from primary ones.
an abnormality of small blood vessels (microscopically, an arteriovenous malformation), identified predominantly in the mucosal lining of the upper stomach, that may cause severe spontaneous haemorrhage. It can rarely be found in the duodenum, colon, jejunum, or oesophagus. If detected endoscopically, curative therapy is often possible, although the abnormality is often difficult to see at gastroscopy. Surgical exploration may be required if the bleeding is unresponsive to endoscopic treatment. [G. Dieulafoy (1839–1911), French physician]... dieulafoy’s lesion
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