Anoscopy: Does It Also Examine the Rectum? - Surgery

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Rectal examination


Doctor Ke, I went to the outpatient clinic because I had blood in my stool, and the doctor performed a sigmoidoscopy and diagnosed me with internal hemorrhoids.
I would like to ask if the sigmoidoscopy also examines the rectum?

123, 20~29 year old female. Ask Date: 2017/07/21

Dr. Ke Fangxu reply Surgery


The length of the analoscope is approximately 7-8 centimeters, so it primarily examines the anal canal and rectum, allowing visibility of only the lower end.

Reply Date: 2017/07/21

More Info


Anoscopy is a medical procedure that involves the examination of the anal canal and lower rectum using a specialized instrument called an anoscope. This procedure is typically performed to evaluate symptoms such as rectal bleeding, pain, or other abnormalities in the anal region. Given your situation of experiencing blood in your stool, it is understandable that you have concerns about the extent of the examination and whether the rectum was also assessed during the anoscopy.

To answer your question directly: while an anoscope primarily focuses on the anal canal, it can also provide a limited view of the lower rectum. The anoscope is designed to allow the physician to visualize the anal area and the lower part of the rectum, generally up to about 10 centimeters from the anal verge. Therefore, if the physician performed an anoscopy, they would have been able to examine the lower rectum, but not the entire rectum or colon.

In your case, since the doctor diagnosed you with internal hemorrhoids, it is likely that they were able to see the hemorrhoids and any other abnormalities in the anal canal and the lower rectum. However, if there were concerns about other potential issues higher up in the rectum or colon, a more comprehensive examination, such as a flexible sigmoidoscopy or colonoscopy, might be warranted. These procedures allow for a more thorough evaluation of the rectum and the entire colon.

It is important to note that while anoscopy can identify certain conditions, it has its limitations. For example, it may not detect issues that are located further up in the rectum or colon, such as polyps, tumors, or other gastrointestinal disorders. If you continue to experience symptoms such as rectal bleeding, changes in bowel habits, or any new symptoms, it is crucial to follow up with your healthcare provider. They may recommend additional testing to ensure a comprehensive evaluation of your gastrointestinal health.

In summary, anoscopy does provide some examination of the rectum, specifically the lower part, but it is not a substitute for more extensive procedures if there are ongoing concerns. If you have further questions or if your symptoms persist, I encourage you to discuss them with your physician, who can provide guidance on the next steps in your care.

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