The international encyclopaedia of surgery; a systematic treatise on the theory and practice of surgery . oliferation of the perivascular connective tissue, pressurewill not cause their disappearance. Some are very painful, and others en-tirely free from sensibility. _ Venous cutaneous tumors are composed, in great part, of new-formed, erec-tile tissue, analogous to that found in the corpora cavernosa. The structureis white and dense, the caverns communicating freely with each other. Theseat times are found to contain the chalky concretions which have been con-sidered on a previous page as phl
The international encyclopaedia of surgery; a systematic treatise on the theory and practice of surgery . oliferation of the perivascular connective tissue, pressurewill not cause their disappearance. Some are very painful, and others en-tirely free from sensibility. _ Venous cutaneous tumors are composed, in great part, of new-formed, erec-tile tissue, analogous to that found in the corpora cavernosa. The structureis white and dense, the caverns communicating freely with each other. Theseat times are found to contain the chalky concretions which have been con-sidered on a previous page as phleboUtes. The circulation is active in thesetumors, and their volume variable. The walls of the sinuses contain a dense, fibrous stroma, involuntary mus-cular tissue, and striated muscular fibres when the tumor is encroaching onthe muscles. They are lined by the same endothelium as the normal specimens removed and immediately immersed in alcohol, which causesinstant coagulation of the blood in the sinuses, it is found that the blood pre- 368 SURGICAL DISEASES OF THE VASCULAR SYSTEM. Fig. Cavernous angeioma of the liver. Sectionmade after the tumor had been immediatelysubmerged in alcohol: a, cavernous spaces filledwith blood-corpuscles ; 6, fibrous walls of thesinuses. Magnified 150 diameters. (From Cor-nil and Ranvier.) sents the same appearances as the normal blood, but that the ^vhite corpusclesare less numerous. They do not adhere to the walls of the vessels. This is con-sidered as proof of a rapid circulation, sincein veins where the circulation is weakenedor retarded, the leucocytes tend to adhereto the walls. After excision the vesselscontract, forcing out their contents, and themass shrinks to a comparatively small tumors are not all erectile, andsome which have been erectile for a timelose this property. Gross describes a formof n?evoid tumor as ncevoid elephantiasis^consisting of a hypertrophied conditionof the skin and subcutaneous connective
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