Manual of pathology : including bacteriology, the technic of postmortems, and methods of pathologic research . a to injury, maygive rise to papillomas of the tongue or papillae vary in length: in the ordinarywart they are short; in the villous papillomathey appear as long, delicate fibrils, giving offsecondarv and tertiary shoots. On the skin theepithelial covering is thick, hard, and stratified,and actually binds the papillae into a solidmass; on mucous membranes the slender vascular processes are coveredwith very delicate and easily lacerated epithelium. Site.—Papilloma may appear
Manual of pathology : including bacteriology, the technic of postmortems, and methods of pathologic research . a to injury, maygive rise to papillomas of the tongue or papillae vary in length: in the ordinarywart they are short; in the villous papillomathey appear as long, delicate fibrils, giving offsecondarv and tertiary shoots. On the skin theepithelial covering is thick, hard, and stratified,and actually binds the papillae into a solidmass; on mucous membranes the slender vascular processes are coveredwith very delicate and easily lacerated epithelium. Site.—Papilloma may appear anywhere on the skin or mucous mem-brane; as a rule, they grow from, and closely imitate, pre-existingpapillae. They rarely occur where no papillae exist; in such rare casesthe connective-tissue core springs directly from the subepithelial con-nective tissue—this is the case in the stomach and larynx. Clinical Characters.—Clinically, warts are benign, or may occur at any age; may be single or multiple; may disappearwithout any operative interference: this is especially true of multiple. Fig. 165. — Papilloma{Gould.) TUMORS. .S7 warts. When occurring on mucous surfaces, they are highly vascular,and, owing to their thin epithelial covering and delicate connective-tissue matrix, are easily torn, sometimes giving rise to fatal is especially true of papilloma of the bladder and similar growthsoccurring in the urethral orifice. In the young, warts are occasion-ally transformed into sarcomata; in advanced life warts and wartysurfaces (ichthyosis linguie) may be converted into cancer. Varieties.—(i) Skin ivarts: (2) villous warts; (3) intracystic warts. 1. Skin Warts.—(See Fig. 165.) Skin warts are overgrown papilla*,and on section the epithelium will be found to pass from one papilla toanother in an unbroken line without invading the fibrous vary in size, and may become mottled with black pigment (melan-otic). Cutaneous warts ma
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