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Colonic Polyps: Types, Causes, Symptoms, Diagnosis, Treatment, Prevention, Complications

Colonic Polyps: Types, Causes, Symptoms, Diagnosis, Treatment, Prevention, Complications

What is Colonic (Colorectal) Polyps?

Colonic polyps, also known as colorectal polyps, are growths that appear on the surface of the colon. The colon, or large intestine, is a long hollow tube at the bottom of the digestive tract. It’s where the body makes and stores stool.

Polyps in the colon can vary in size and number.

Types of Colonic (Colorectal) Polyps

  • Hyperplastic polyps are harmless and don’t develop into cancer.
  • Adenomatous polyps are the most common. Although most will never develop into cancer, they do have the potential to develop into colon cancer.
  • Malignant polyps are polyps that are noted under microscopic examination to have cancer cells in them.

Causes of Colonic (Colorectal) Polyps

Doctors don’t know the exact cause of colonic polyps, but polyps result from abnormal tissue growth.

The body periodically develops new healthy cells to replace old cells that are damaged or no longer needed. The growth and division of new cells is usually regulated. In some cases, however, new cells grow and divide before they’re needed. This excess growth causes polyps to form. The polyps can develop in any area of the colon.

Symptoms of Colonic (Colorectal) Polyps

In most cases, polyps don’t cause symptoms and are usually found on routine colon cancer screening exams. However, if you do experience symptoms, they may include:

  • blood in the stool or rectal bleeding
  • pain, diarrhea, or constipation that lasts longer than one week
  • nausea or vomiting if you have a large polyp

Blood on your toilet tissue or blood-streaked stools may be an indication of rectal bleeding and should be evaluated by a doctor.

It’s important to have regular screening tests to detect any existing polyps. When colonic polyps are found in the early stages, they can often be removed safely and completely during a colonoscopy. Removing polyps may reduce your risk of developing colon cancer.

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Risk factors of Colonic (Colorectal) Polyps

Although the specific cause of colonic polyps isn’t known, there are certain factors that can increase your risk of developing colonic polyps. These risk factors include:

  • being over age 50
  • being overweight
  • having a family history of polyps or colon cancer
  • having had polyps in the past
  • having had ovarian cancer or uterine cancer before age 50
  • having an inflammatory condition that affects the colon, such as Crohn’s disease or ulcerative colitis
  • having uncontrolled type 2 diabetes
  • having a hereditary disorder, such as Lynch syndrome or
  • Gardner’s syndrome

Lifestyle behaviors that may contribute to the growth of colonic polyps include:

  • smoking
  • drinking alcohol frequently
  • having a sedentary lifestyle
  • eating a high-fat diet

You may be able to lower your risk for colonic polyps if you make lifestyle changes to address these behaviors. Regularly taking a low dose of aspirin and adding more calcium to your diet may also help prevent polyps. Your doctor may have other suggestions for reducing your risk.

Diagnosis of Colonic (Colorectal) Polyps

Polyps can be found on a number of tests. These tests may include:

  • Colonoscopy: During this procedure, a camera attached to a thin, flexible tube is threaded through the anus. This allows your doctor to view the rectum and colon. If a polyp is found, your doctor can remove it immediately or take tissue samples for analysis.
  • Sigmoidoscopy: This screening method is similar to a colonoscopy, but it can only be used to see the rectum and lower colon. It can’t be used to take a biopsy, or a sample of tissue. If your doctor detects a polyp, you’ll need to schedule a colonoscopy to have it removed.
  • Barium enema: For this test, your doctor injects liquid barium into your rectum and then uses a special X-ray to take images of your colon. Barium makes your colon appear white in the pictures. Since polyps are dark, they’re easy to identify against the white color.
  • CT colonography: This procedure uses a CT scan to construct images of the colon and rectum. After the scan, a computer combines the images of the colon and rectum to produce both 2- and 3-D views of the area. A CT colonography is sometimes called a virtual colonoscopy. It can show swollen tissues, masses, ulcers, and polyps.
  • Stool test: Your doctor will give you a test kit and instructions for providing a stool sample. You’ll return the sample to your doctor’s office for analysis, especially to test for microscopic bleeding. This test will show if you have blood in your stool, which can be a sign of a polyp.
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Complications of Colonic (Colorectal) Polyps

Colonic polyps don’t usually cause any symptoms and are most often discovered on routine colon screenings, such as a colonoscopy or a sigmoidoscopy. Your best option for finding out if you have colonic polyps is to have colon screenings regularly when your doctor recommends them.

Polyps can often be removed at the same time as the screening procedure. Though polyps are usually benign, doctors most often remove them because some types of polyps can later develop into cancer. Removing colonic polyps can help prevent colon cancer from developing.

A healthy diet, including foods rich in vitamin D, calcium, and fiber, can lower your risk for developing colonic polyps.

Treatment of Colonic (Colorectal) Polyps

The best way to treat colonic polyps is to remove them. Your doctor will likely remove your polyps during a colonoscopy. The polyps are then examined under the microscope to see what type of polyp it is and if there are any cancer cells present. Doctors can usually get rid of polyps without performing surgery.

However, you may need surgery to remove the polyps if they’re large and can’t be removed during a colonoscopy. In most cases, this can be done by laparoscopic surgery. This type of surgery is minimally invasive and uses an instrument called a laparoscope. A laparoscope is a long, thin tube with a high-intensity light and a high-resolution camera at the front. The instrument is inserted through an incision in the abdomen. Once your surgeon has a visual of your colon, they’ll remove the polyps using a special tool.

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A pathologist, or someone who specializes in tissue analysis, will check the polyps for cancerous cells.

Prevention of Colonic (Colorectal) Polyps

Maintaining a healthy diet can help prevent the development of colonic polyps. This includes eating more fruits, vegetables, whole grains, and lean meat. You may also be able to prevent polyps by increasing your intake of vitamin D and calcium. Foods that are rich in vitamin D and calcium include:

  • broccoli
  • yogurt
  • milk
  • cheese
  • eggs
  • liver
  • fish

You can further lower your risk for colonic polyps by reducing your intake of high-fat foods, red meat, and processed foods. Quitting smoking and exercising regularly are also important steps to prevent the development of colonic polyps.

Long-Term outlook of Colonic (Colorectal) Polyps

Colonic polyps are usually noncancerous and considered harmless. They often don’t cause any symptoms unless they’re very large. Removing polyps can reduce or eliminate any related symptoms. It can also help prevent colon cancer from developing in the future.

If you have polyps, you have a higher risk of developing more polyps in the future. Your doctor will recommend repeat screening in three to five years.

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