As a background for the principal thesis of this discussion, I wish to present certain approximate statistics which will set the stage for an argument for the more general use of sigmoidoscopy: 1. Cancer of the large intestines is the fourth most frequent malignant tumor found in women and second in frequency only to cancer of the stomach in men. 2. Eighty per cent of cancers of the bowel are in the sigmoid and rectum. 3. Seventy-eight per cent of cancers of the sigmoid and rectum are palpable. 4. Ninety per cent of cancers of the sigmoid and rectum are visible through the sigmoidoscope. 5. Seventy-five per cent of malignant tumors of the large bowel develop on the basis of adenomas. This last statement makes the adenoma a very important link in the development of carcinoma of the colon.
WHY THE ADENOMA IS CONSIDERED A PRECANCEROUS LESION
1. Five to
Runyeon FG. SIGMOIDOSCOPY: ITS CLINICAL IMPORTANCE TO THE PRACTITIONER: CHAIRMAN'S ADDRESS. JAMA. 1951;147(10):913–914. doi:10.1001/jama.1951.03670270003002
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