. American practice of surgery ; a complete system of the science and art of surgery . t change takes place in it; (5) Leucoplasia of the tongue and of the cheeks. Besides the above diseases, in which the development of cancer may be lookedupon as a more or less natural consequence, there are other conditions in which cancer occurs occasionally. Such are,for example, cicatrices, in whichepitheliomas develop frequentlyenough to show that it is a predis-posed tissue; old patches of lupusvulgaris; old tertiary syphilides;long-existent patches of psoriasis;obstinate patches of lupus erythe-matosus
. American practice of surgery ; a complete system of the science and art of surgery . t change takes place in it; (5) Leucoplasia of the tongue and of the cheeks. Besides the above diseases, in which the development of cancer may be lookedupon as a more or less natural consequence, there are other conditions in which cancer occurs occasionally. Such are,for example, cicatrices, in whichepitheliomas develop frequentlyenough to show that it is a predis-posed tissue; old patches of lupusvulgaris; old tertiary syphilides;long-existent patches of psoriasis;obstinate patches of lupus erythe-matosus; and, occasionally, sebaceouscysts. Arsenic, when it has beengiven for a long time, and has causedkeratosis arsenicalis, is also said topredispose to cancer (Hutchinson). The nsevo-carcinomas which arederived from birth-marks have beenconsidered under Nsevi. Males are more frequently affected with epithelioma than females, and this is probably due to their greater exposure to irritations. As examples of such irritations we may mention senile seborrhceic patches, resulting from ex-. FiG. 53.—Epithelioma, Showing Rohed Border(Originah) SURGERY OF DISEASES OF THE SKIN. 375 posure to the weather, and Icucoplasia of (he tongue, which is attributed to theeffects of tobacco smoke. Some famiUes are more disposed to epithehoma than are others. This maybe due to some inherent weakness of the skin, that renders it more hable to theformation of senile patclies, which in turn sometimes give rise to epithehoma.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectsurgery, bookyear1906
