| haemorrhoids | <anatomy, surgery> A varicose dilatation of a vein of the superior or inferior haemorrhoidal plexus, resulting from a persistent increase in venous pressure. Presents as a livid and painful swelling formed by the dilation of the blood vessels around the margin of, or within, the anus, from which blood or mucus is occasionally discharged. The singular haemorrhoid is rarely used. Synonym: piles. Origin: Gr. Haimorrhois, L. Haemorrhoidae. (01 Dec 1998) |
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| haemorrhoids, external | Haemorrhoids that occur below the dentate line and are generally painless. They are sometimes called skin tags, or can be seen or felt as extra skin around the anus. External haemorrhoids can become very distressing when the blood in the external haemorrhoid clots and inflammation irritates the nearby pain-sensitive skin. This condition is called a thrombosed external haemorrhoid and is quite painful. (07 Jan 1998) |
| haemorrhoids, internal | Haemorrhoids that occur above the dentate line in the anal canal which separates two types of anal skin. The skin above the dentate line is not sensitive to pain. Internal haemorrhoids, being above the dentate line, are therefore usually painless. They can cause bleeding or they may push out of (prolapse) the anal opening when they become quite large. (07 Jan 1998) |
| cutaneous haemorrhoids | Hyperplasia of the connective tissue in one or more of the normal radiating folds of the skin immediately surrounding the anus. (05 Mar 2000) |
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| internal haemorrhoids | Dilated veins beneath the mucous membrane within the sphincter. (05 Mar 2000) |
| external haemorrhoids | Dilated veins forming tumours at the outer side of the external sphincter. (05 Mar 2000) |
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