General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . Fig. 48. -Papilloma of the scalp. The branching fibrous stroma is covered by an abnor-mally thickened, irregular epithelium. (Boyce.) 138 GENERAL TATHOLOGY Adenomata Adenomata are tumors resembling in structure an epithelialgland and developing from glandular epithelium. Etiology.—They are caused by irritation, as in gastrointestinaladenomata, by tissue inclusions, as in renal adenomata. Inother cases the causes are obscure. Their favorite seats are the mucous mem
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General and dental pathology with special reference to etiology and pathologic anatomy; a treatise for students and practitioners . Fig. 48. -Papilloma of the scalp. The branching fibrous stroma is covered by an abnor-mally thickened, irregular epithelium. (Boyce.) 138 GENERAL TATHOLOGY Adenomata Adenomata are tumors resembling in structure an epithelialgland and developing from glandular epithelium. Etiology.—They are caused by irritation, as in gastrointestinaladenomata, by tissue inclusions, as in renal adenomata. Inother cases the causes are obscure. Their favorite seats are the mucous membrane, especially ofthe pylorus, duodenum and rectum; the skin—sebaceous and. Fig. 49.—Adenoma of the mamillary gland, with cystic enlargement of acini and abundantinterglandular hyperplasia of connective tissue. (Stengel and lox.) sweat glands; certain organs, as the mammary glands (the mostfrequent seat), liver, kidney, adrenals, thyroid, ovary and uterus.Gross Pathology.—Adenomata occur as more or less diffuse, sessile growths, sometimes pedunculated or papillomatous inform; or within organs as nodular tumors, firm, usually singleand encapsulated, capable of being shelled out, though at timesadherent. On section the cut surfaces usually bulge andresemble, more or less, the parent gland, being grayish pinkin the mammae, and red in the thyroid gland. tumors 139 Pathologic Histology.- Acini with single layers of columnarepithelium (sometimes several layers) are seen enclosed by con-nective-tissue reticula, which contain the blood vessels. The ex-cretory duds are absent or poorly developed. When the tissue corresponds closely to the normal arrange-ment, the t