Polyps are asymptomatic and usually found on screening colonoscopies for CRC. Patients may present with painless rectal bleeding of bright or dark red color, on wiping or with bowel movements mixed with stools or dripping. Other presentations include diarrhea, constipation, abdominal pain, mucus with stools, or with symptoms and signs of iron deficiency anemia secondary to chronic bleeding. A physical exam is usually normal, although rectal polyps may be palpated on digital rectal exam or if they are prolapsed. Fecal occult blood test (FOBT) by digital rectal exam (DRE) is not as effective as FOBT done on stool passed spontaneously.

Initial testing includes CBC to check for anemia found in chronic bleeding and BMP to check for electrolyte disorders as with hypersecretory adenomas. Guaiac (gFOBT) uses a chemical indicator with color change in the presence of blood and immunochemical (iFOBT or fecal immunochemical test []) uses antibodies against human hemoglobin. Stool DNA test is more sensitive but less specific than fecal immunochemical test (FIT).[10][11][12]

The gold standard test for polyps detection is colonoscopy, where polypectomy is done, and management is based on pathology results. This is however not a faultless screening test, as it has increased miss rate with low colon prep quality, smaller polyp, right-sided colon polyps, and less experience of the endoscopist. Patients found to have more than ten colorectal adenomas should be tested for MUTYH and APC. A newer way of screening is computed tomographic colonography (CTC) which requires excellent bowel preparation and is less sensitive with flat polyps. Other ways to diagnose are with double-contrast barium enemas and colon capsule endoscopies. Further research is still needed for enhanced optical technologies which may be used to differentiate between neoplastic and non-neoplastic colonic polyps, and they include narrowed spectrum endoscopy narrow-band imaging [NBI], confocal laser endomicroscopy [CLE], Fujinon intelligent chromoendoscopy [FICE] and image-enhanced endoscopy [i-scan].

Colonic polypectomy is done during colonoscopy for diagnostic and therapeutic purposes using snare polypectomy with electrocautery for pedunculated polyps, or mucosal resection for sessile polyps. Total colectomy with ileorectal anastomosis or proctocolectomy ileal pouch anal anastomosis is done for prophylactic reasons for Familial Adenomatous Polyposis (FAP) and MUTYH-associated polyposis (MAP). They may also be done with persistent bleeding or when there are too many polyps. Guidelines for CRC screening recommend a colonoscopy starting at age 50 for the general population, earlier for at-risk patients, and to stop screening if life expectancy is less than ten years. Risk factors for colon cancer include polyp pathology (adenomatous, serrated, with high-grade dysplasia, with more than 25% villous histology), polyp more than 1 cm in diameter, polyps located in the proximal colon and the number of polyps more than three. Hence, a follow-up colonoscopy is recommended to be done in 10 years if no polyps or distal small hyperplastic polyps are found; in five years if there are small sessile serrated polyps with no dysplasia; in three years if they are large sessile serrated polyp(s) or with dysplasia or traditional serrated adenoma. Other guidelines include screening in five to ten years if one or two small tubular adenomas are seen; in three years if there are three to ten adenomas; in less than three years if there are more than ten adenomas; and in three years if at least one adenoma is ten mm in diameter or more. Alternatively, also screen in three years if one or more adenomas show villous features of any or with high-grade dysplasia. Colectomy is recommended in cases of resected polyps with high-risk features of malignancy (lower third of the submucosa invasion, indeterminate or positive resection margins, margin less than 1 mm, lymphovascular invasion, or poor differentiation) as there is a high incidence of lymph node metastasis.[13][14]

• Pseudopolyps
• Juvenile polyposis
• Hyperplastic polyposis
• Familial polyposis coli
• Turcot syndrome
• Cowden syndrome
• Peutz jegher syndrome

• Bleeding
• Diarrhea
• Bowel obstruction
• Cancer

Recommendations that may decrease the incidence of colon polyps include low-fat, high fiber diet, decreased alcohol intake, and smoking cessation. No benefit was noted to decrease rates of CRC with the use of multivitamins, folate, calcium, statins, azathioprine or 6-mercaptopurine. Some studies found benefit using NSAID's and calcium in patients with FAP and MAP, where they may decrease the incidence and recurrence of polyps.

Because there is a potential risk of malignancy, all patients should be educated about polyps and follow up. Patients with a family history of polyps may benefit from screening colonoscopy. Those with hereditary nonpolyposis colon cancer should undergo screening colonoscopy every 1-2 years. In addition, these patients are also at risk for cancers in the ovary and uterus. [15][16](Level V)

Outcomes

When colonic polyps are removed, the condition is cured. If the polyp is not removed then it may cause bleeding, intussusception or even become malignant. However, colonic polyps grow slowly, and formation of a small polyp can take up to a decade. The risk of cancer is much higher in hereditary nonpolyposis cancer. The risk of cancer from a sporadic 1 cm colonic polyp is about 8% at ten years and 24% at 20 years. Ultimately the risk of malignancy also depends on the type of polyp, histology and if there is an association with polyposis syndromes. [17][18](Level V)