It is the most common neoplasm of colon and rectum. This condition is rare in patients under 20 years of age. Its incidence increases as age advances and majority of patients are in the sixth decade.
Distribution of this tumor is variable, but about 70% occur in rectum, rectosigmoid and lower sigmoid colon within the reach of the sigmoidoscope, 20% in the upper and middle sigmoid colon, 3% in the descending colon and only 2% each in transverse and ascending colon.
Majority of the tubular adenomas are asymptomatic and are discovered on routine proctosigmoidoscopy or barium enema performed for some other reason.
When these become symptomatic, the most common symptom is modest degree of rectal hemorrhage. Mucus discharge per rectum and something coming out through anus are other symptoms which may be complained of.
Anemia of unknown cause is there. Abdominal pain is also there. Intestinal obstruction due to intussusception is extremely rare. If the polyp becomes large enough to cause obstructive symptoms it is usually malignant.
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