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NAEVUS

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Originally appearing in Volume V19, Page 150 of the 1911 Encyclopedia Britannica.
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NAEVUS , a See also:

term in See also:surgery signifying that See also:form of See also:tumour which is almost entirely composed of enlarged See also:blood-vessels. There are three See also:principal varieties: (r) the capillary naevus, consisting of enlarged capillaries, frequently of a purplish See also:colour, hence the term " See also:port-See also:wine stain "; (2) the venous naevus, in which the See also:veins are enlarged, of a bluish colour; (3) the arterial naevus, in which there is distinct pulsation, it being composed of enlarged and tortuous See also:arteries. The naevus can be lessened in See also:size by pressure. It genetaily occurs in the skin or immediately under it; sometimes it lies in the mouth in connexion with the mucous membrane. It is often congenital, hence the term " See also:mother's See also:mark," or it may appear in See also:early childhood. It often grows rapidly, sometimes slowly, and sometimes growth is checked, and it may gradually diminish in size, losing its vascularity and becoming fibrous and non-vascular. This natural cure is followed by less deformity than a cure by artificial means. Various methods are used by surgeons when an operation is called for: (1) the tumour may be excised; (2) a ligature tightly tied may be applied to the See also:base of the tumour; (3) inflammation may be set up in the growth by the injection of irritating agents, —in this way its vascularity may be checked and the formation of fibrous See also:tissue encouraged; (4) the blood in the enlarged vessels may be coagulated by the injection of coagulating agents or by See also:electrolysis.

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