Rectoscopy - fibreoptic instruments (rectoscope, anoscope) are also used to examine the rectum and anus.

A colonoscopyshould be performed after defecation and after a purging enema.

A anuswith a rectoscope inserted through the anusa section of about 20-25 cm from the anusthe folds can be smoothed out, so that cracks and haemorrhoidal lesions are more easily observed.