. The principles and practice of modern surgery. l nsevus may also be destroyed by puncturing it, andinserting into the puncture a glass pen dipped in nitric acid; this is alsoa good method of removing little red spots on the face, formed by a dis-tended vessel with radiating branches; but immediately after applyingthe acid, the part should be sponged with a solution of carbonate of soda,to prevent any scar on the skin. Mr. Fergusson sometimes passes aneedle through a small nsevus, and twists a thread over it, as in insertingthe twisted suture, allowing it to remain for forty-eight hours or lo
. The principles and practice of modern surgery. l nsevus may also be destroyed by puncturing it, andinserting into the puncture a glass pen dipped in nitric acid; this is alsoa good method of removing little red spots on the face, formed by a dis-tended vessel with radiating branches; but immediately after applyingthe acid, the part should be sponged with a solution of carbonate of soda,to prevent any scar on the skin. Mr. Fergusson sometimes passes aneedle through a small nsevus, and twists a thread over it, as in insertingthe twisted suture, allowing it to remain for forty-eight hours or longer. Extirpation of these tumors is practicable only when they are of thecutaneous variety, or when they can be lifted up from the parts beneath,so that their whole extent can be ascertained. If it is done with theknife, two elliptical incisions should be made, to include the whole of thediseased growth, and a little of the sound tissues around. For, to useMr. Guthries words, it cannot be too forcibly impressed on the mind 296 N^VUS, Fiff. of the surgeon, that if the diseased part be cut into, the bleeding -will beterrific and difficult to stop. But it is generally considered that the ligature is the safest and best method. The most convenient formof using it is to pass two or threeneedles crucially through the base ofthe tumor, and then twist a strong silkligature firmly round beneath instead of this, two or more doubleligatures may be passed through thebase of the tumor, with a curvedneedle which has its eye at its point-ed extremity, and then the tumormay be strangulated by tying the ad-jacent threads together.* [See cut.]The tumor may be punctured beforethe threads are finally tightened, butin every case the constriction shouldbe made as tight as possible. If theskin is not implicated, it may be dis-sected back in flaps before the liga-tures are passed. Another method analogous to extirpation, is the division of all the softparts around the tumor. This was onc
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