. The principles of surgery . mparativelysubordinate part in the development of the tumour. This morbid struc-ture is not found in the substance of the true skin, like the preceding,but in the subjacent areolar tissue; of various size and prominence;causing a doughy elastic swelling, of a livid hue—venous structureappearing with tolerable distinctness through the superimposed integu-ment. If breach of surface take place, hemorrhage is profuse, and chieflyof the venous character; capable of being arrested by pressure, withoutmuch difficulty. If an incision pervade the mass to any considerableex
. The principles of surgery . mparativelysubordinate part in the development of the tumour. This morbid struc-ture is not found in the substance of the true skin, like the preceding,but in the subjacent areolar tissue; of various size and prominence;causing a doughy elastic swelling, of a livid hue—venous structureappearing with tolerable distinctness through the superimposed integu-ment. If breach of surface take place, hemorrhage is profuse, and chieflyof the venous character; capable of being arrested by pressure, withoutmuch difficulty. If an incision pervade the mass to any considerableextent, arterial branches may be found spouting with much activity ; butstill the main stream is dark and venous. Or the tumour may be sub-mucous; as exemplified by one kind of hemorrhoid—situated partlywithin and partly without the verge of the anus. 3. The third form of swelling is composed of dilated blood-vessels,which, closely crowded together, open into each other at many points. Fig. 197. Outline of aneurysmal 560 ERECTILE TUMOUR. These openings may be of secondary formation ; the result of closeapposition in the dilated vessels. Or, more probably, they are primary ;the structure consisting of a network of dilated capillaries ; the openingsof communication being the ordinary and original inosculations, andwhat were intervascular spaces being now condensed into mere fibrousbands. The whole constitutes a vascular network of great capacity andactivity of circulation; supplied, for reception of the returned blood,with large and tortuous veins, whose lining membrane is plainly con-tinuous with that of the abnormal vascular Also, in the neigh-bourhood, are to be found the feeding arteries ; originally, perhaps,twigs, now enlarged to trunks ; pulsating strong-Fig- 198. ly? and obviously carrying on a plentiful andactive supply. The mass maybe subcutaneous;constituting the true aneurism by anastomosis orerectile tumour; varying in bulk and tension,according as
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