Related Experiment Videos
Right-sided shift found in metachronous colorectal adenomas
1Dept. of Medicine 1, University of Erlangen, Germany. gerhard.nusko@med1.imed.uni-erlangen.de
Endoscopy
|July 27, 2001
Summary
Patients with colorectal adenomas require surveillance for new polyps. Metachronous adenomas frequently appear in the right colon, not the original site, necessitating total colonoscopy for effective surveillance.
Area of Science:
- Gastroenterology
- Oncology
- Preventive Medicine
Background:
- Patients with a history of colorectal adenoma have an increased risk of developing metachronous adenomas.
- Surveillance strategies aim to detect these new adenomas early.
Purpose of the Study:
- To investigate whether metachronous adenomas occur at the same anatomical site as initial adenomas.
- To determine if surveillance can be site-specific using flexible sigmoidoscopy or total colonoscopy.
Main Methods:
- Prospective follow-up of 1091 patients from the Erlangen Registry of Colorectal Polyps (1978-1996).
- Analysis of anatomical sites of two generations of metachronous adenomas using logistic regression.
- Evaluation of missed proximal lesions with flexible sigmoidoscopy.
Main Results:
- Metachronous adenomas were found in 51% of patients.
- A significant right-sided shift in adenoma location was observed in 37.9% of first-generation and 27.1% of second-generation metachronous adenomas.
- Flexible sigmoidoscopy would miss over 50% of proximal metachronous adenomas.
Conclusions:
- Metachronous adenomas show a significant tendency to appear in the right colon, deviating from the initial adenoma site.
- Total colonoscopy is recommended for surveillance to ensure comprehensive detection, irrespective of the initial adenoma's location.