General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . f tissue involved: 1. Connective tissue; fibroma, myxoma, chondroma, osteoma,lipoma. Embryonic or malignant type—sarcoma. 2. Muscle tissue; leiomyoma and rhabdomyoma. 3. Nerve tissue; glioma and neuroma. 4. Vascular tissue; angioma—hemangioma and lymphangioma. 5. Epithelial tissue; papilloma and adenoma. Embryonic ormalignant type—carcinoma. 6. Teratomata or complex new growths. TUMORS 117 FibromataFibromata are tumors composed of wavy bundles of connec I ive tiss
General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . f tissue involved: 1. Connective tissue; fibroma, myxoma, chondroma, osteoma,lipoma. Embryonic or malignant type—sarcoma. 2. Muscle tissue; leiomyoma and rhabdomyoma. 3. Nerve tissue; glioma and neuroma. 4. Vascular tissue; angioma—hemangioma and lymphangioma. 5. Epithelial tissue; papilloma and adenoma. Embryonic ormalignant type—carcinoma. 6. Teratomata or complex new growths. TUMORS 117 FibromataFibromata are tumors composed of wavy bundles of connec I ive tissue. Etiology. Some of these tumors result from injury or contin-ued irritation; the causation of others is obscure. The favorite seats are the subcutaneous and submucous tis-sues, periosteum, sheaths of tendons and nerves, uterus, ovaries,kidney, heart, dura mater, etc. There are two types of these tumors—the hard and the soft. Gross Pathology.—Hard fibromata vary in size from a? minutepoint to a fist; they are sometimes lobulated and frequently mul-tiple; are pale, firm, cutting like leather. On section, surfaces. Fig. 31.—Hard fibroma. (Warren.) show irregular bands or whorls of fibers, often resembling thegrain in wood. They are usually encapsulated. A subvariety is the painful subcutaneous tubercle, beingabout the size of a coffee bean, very firm and circumscribed. Fibromata of the^ uterus are a combination of fibroma andmyoma, often called fibromyoma, or simply fibroid. Thesemay become very large, weighing fifty pounds or more; are usu-ally multiple and very hard. Keloids are hard subcutaneous fibromata, of irregular star-like outline, not encapsulated, but tend to spread: they often looklike the scars of burns, and usually arise from scars in thosewho manifest a congenital predisposition. Keloids occur oftenestin negroes. 118 GENERAL PATHOLOGY Microscopically are seen dense, matted, fibrous bands with rel-atively few cells; blood vessels are few and have thick
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