The Question
A 52-year-old man is referred for his first screening colonoscopy. He is asymptomatic and feels well. His family history is notable for a father who had "colon polyps" removed in his 60s but no known colorectal cancer. The patient takes no medications. On colonoscopy, he is found to have 35 adenomatous polyps, ranging from 3 mm to 8 mm in size, distributed throughout the colon from the cecum to the sigmoid. The rectum is relatively spared. All polyps are removed, and pathology confirms them as tubular adenomas, none with high-grade dysplasia. Which of the following is the most appropriate next step in management?
See the answer and explanation below:
Post-Call Recovery Reads
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View on AmazonThe Correct Answer
C
Explanation
Clinical Pearl:
The finding of 20 or more synchronous colorectal adenomas should prompt referral for genetic counseling and testing for hereditary polyposis syndromes, primarily attenuated familial adenomatous polyposis (AFAP) and MUTYH-associated polyposis (MAP).
Explanation:
This patient's presentation with 35 adenomas is highly suggestive of an underlying hereditary polyposis syndrome. While not meeting the criteria for classic familial adenomatous polyposis (FAP), which typically involves hundreds to thousands of polyps, this polyp burden is characteristic of attenuated FAP (AFAP) or MUTYH-associated polyposis (MAP). Therefore, the most critical next step is to establish a genetic diagnosis. Referral for genetic counseling and testing for mutations in the APC gene (associated with FAP and AFAP) and the MUTYH gene (associated with MAP) is essential. This diagnosis will guide long-term management, including the intensity of endoscopic surveillance, the potential need for prophylactic surgery, and screening for at-risk family members. While annual colonoscopy will likely be required, this is a surveillance strategy determined by the underlying diagnosis, which must be established first. Total proctocolectomy is overly aggressive at this stage, as the polyp burden may be manageable endoscopically, and there is no evidence of cancer or high-grade dysplasia. Upper endoscopy is indicated for surveillance in patients with AFAP or MAP but is not the primary diagnostic step. Aspirin is not a first-line intervention in this setting.
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