Can an anal fissure be detected by a colon rectal surgeon by a digital rectal exam or anoscopy?

Not so deep. This can often be detected by simply spreading the anal opening by lateral traction on adjacent skin. Any primary care doc can find the common ones. Anoscopy can see further up but is usually unnecessary unless you are looking for a source of bleeding.
Yes. It can be if its located in the rectal vault. Anoscopy can visualize somewhat higher up and can detect fissues as well.

Related Questions

I think I have either anal fissure or internal hemorrhoid, had rectal exam before no result. Still pain and blood in toilet. Should doc do anoscopy?

Blood in stools. It would be important to do a colonoscopy because blood on the stools could be due to colon polyps which are precancerous or internal hemorrhoid and it could also be due to colon cancer. Read more...
Yes. Go back to your doctor for a more thorough examination. Anoscopy may be one way. Read more...
Yes. You need a thorough rectal exam. Sometimes this can be very difficult to do in the office, especially if the area is very painful. It might require an exam under anesthesia in the OR. See your doctor and/or surgeon. Read more...

How is a digital rectal exam done to detect colon cancer?

Carefully. The physician will insert a gloved finger into the rectum, feeling for abnormal masses and or blood, stool should be tested immunologically for blood. Although still considered a screening evaluation that is acceptable, a colonoscopy is still the best screening tool we have for early colon/rectal cancer detection. Read more...
May not. A digital rectal examination can only test as far a finger will go into the rectum. A finger inserted through the anus cannot reach colon, therefore a digital rectal examination cannot detect colon cancer. However, rectum is part of the colon and a common site for cancer and a digital rectal exam is useful. Colonoscopy remains the gold standard for detecting colon cancer. Read more...