Rectoscopy – Procedure, Indications and Risks
Rectoscopy is an endoscopic examination of the rectum. It allows direct visual assessment of the rectal mucosa and aids in diagnosing conditions such as hemorrhoids, polyps, or inflammation.
Things worth knowing about "Rectoscopy"
Rectoscopy is an endoscopic examination of the rectum. It allows direct visual assessment of the rectal mucosa and aids in diagnosing conditions such as hemorrhoids, polyps, or inflammation.
What is a Rectoscopy?
Rectoscopy is a medical examination procedure in which a rigid or flexible tube equipped with a light source – called a rectoscope – is inserted through the anus into the rectum. This allows the physician to directly visualize and assess the rectal mucosa over a length of approximately 15 to 20 centimeters.
The procedure belongs to the category of endoscopic examinations and is used in gastroenterology, proctology, and general medicine. It is a key diagnostic tool for the early detection and diagnosis of a wide range of conditions affecting the lower bowel.
Indications for Rectoscopy
A rectoscopy is performed for various symptoms and clinical questions. Common indications include:
- Blood in the stool or rectal bleeding
- Suspected or confirmed hemorrhoids and their treatment
- Persistent changes in bowel habits (e.g., constipation, diarrhea)
- Suspected rectal polyps or colorectal cancer
- Chronic inflammatory bowel diseases such as ulcerative colitis or Crohn's disease
- Pain in the anal or rectal region
- Follow-up after rectal surgery
- Tissue sampling (biopsy) for further analysis
Procedure
Preparation
Prior to rectoscopy, cleansing of the rectum is typically required. This is usually achieved with an enema applied shortly before the examination to clear stool from the rectum. A full bowel preparation as required for a colonoscopy is not necessary.
Performing the Examination
The procedure is usually performed on an outpatient basis and takes only a few minutes. The patient lies in the lateral or knee-elbow position. The rectoscope is gently inserted through the anus and carefully advanced under direct visualization. A small amount of air is introduced to slightly inflate the bowel, making it easier to assess the mucosal surface.
During the examination, the physician can simultaneously perform minor interventions such as taking tissue samples, removing polyps, or treating hemorrhoids (e.g., via sclerotherapy or rubber band ligation).
After the Examination
Following rectoscopy, patients may experience mild discomfort such as a feeling of pressure or bloating, which typically resolves quickly. Since no sedation is required, patients are immediately able to resume normal activities.
Risks and Complications
Rectoscopy is overall a very safe procedure. Complications are rare but can occasionally occur:
- Minor bleeding, particularly when a tissue biopsy has been taken
- Perforation of the bowel wall – very rare
- Mild pain or discomfort during the procedure
- Infection – extremely rare when performed under proper hygienic conditions
Patients should inform their physician before the examination about any blood clotting disorders, use of anticoagulant medications, or other relevant medical conditions.
Rectoscopy vs. Colonoscopy
Rectoscopy differs from a colonoscopy (full bowel endoscopy) primarily in its scope: while rectoscopy is limited to the rectum (approximately 15–20 cm), colonoscopy allows assessment of the entire large intestine. For comprehensive cancer screening or when disease of the full colon is suspected, colonoscopy is therefore the preferred method.
References
- German Society for Gastroenterology, Digestive and Metabolic Diseases (DGVS): S3 Guideline Colorectal Carcinoma. AWMF Registration No. 021-007OL (2019).
- Herold, G. et al.: Internal Medicine. Self-published, Cologne (2023).
- World Health Organization (WHO): Cancer – Colorectal cancer fact sheet. who.int (2023).
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