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[23.1 ] C. Adenomatous colon polyps are premalignant lesions. The risk of becoming malignant increases as the polyp grows larger. Villous adenomas have the highest risk of malignant transformation, tubular adenomas have the lowest risk, and tubulovillous are intermediate.

[23.2] F. Left lower quadrant abdominal pain with constipation, diarrhea, or alternating bouts is consistent with diverticulitis.

[23.3] A. Hyperplastic polyps are commonly seen during colonoscopy and are of no prognostic significance.

[23.41 D. Colon cancer is the second most common cause of cancer death in the United States. Its prognosis is related to the depth of invasion at the time of diagnosis.

[23.5] E. Chronic, recurrent, painful, loose stooling, often with blood, is consistent with ulcerative colitis. Arthritis can also occur with this disease.

[23.6| B. Blood with wiping, a palpable anal lump, itching, or irritation are common presentations of hemorrhoids.

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