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Diagnostic failure in colonoscopies for malignant disease
B J Miller1, J R Cohen, D E Theile
1Colorectal Unit, Princess Alexandra Hospital, Brisbane, Queensland, Australia. b.miller@mailbox.uq.edu.au
The Australian and New Zealand Journal of Surgery
|June 19, 1998
Summary
Colonoscopy can miss colonic polyps and cancers, leading to delayed diagnosis. Routine use of fluoroscopy during colonoscopy can improve accuracy and lesion detection, preventing misdiagnosis.
Area of Science:
- Gastroenterology
- Endoscopy
- Colorectal Cancer Screening
Background:
- Colonoscopy is generally more accurate than barium enema for detecting colonic polyps and cancers.
- However, instances of misleading colonoscopy results occur, necessitating investigation into their causes and solutions.
Purpose of the Study:
- To identify specific problems and sources of error in colonoscopy procedures.
- To propose solutions to improve the accuracy and reliability of colonoscopy in detecting colorectal lesions.
Main Methods:
- Retrospective analysis of colonoscopy records from the Colorectal Project at Princess Alexandra Hospital.
- Review of cases where colonoscopy misdiagnosed or missed colorectal cancer between 1991 and 1996.
Main Results:
- Eight patients (2.3%) were misdiagnosed by colonoscopy, with lesions missed or misplaced.
- Common errors included failure to confirm examination completeness and inaccurate lesion siting.
- Routine fluoroscopy could have prevented six of the eight errors, and meticulous withdrawal examination could prevent others.
- Missed diagnoses led to an average delay of six months for definitive cancer care.
Conclusions:
- Routine use of fluoroscopy during colonoscopy is recommended to accurately site lesions and confirm complete insertion.
- Ensuring reliable landmarks, such as the terminal ileum, are identified is crucial for confirming examination completeness.