Abstract
Justification and objective: colorectal cancer (CRC) is the third most common malignant neoplasm and the second major cause of cancer-related death. Colonoscopy is the most accurate technique for diagnosing structural lesions in the colon. The aim of this study was to calculate the diagnostic agreement rate (Kappa) of colonoscopy in cases of suspected colorectal cancer and histopathological examination (gold standard) in symptomatic patients examined between 2007-2010. Patients and methods: 233 cases were assessed in this observational prospective study. Results: changes upon colonoscopy suggestive of colorectal cancer were present in 24 (6.87%) patients submitted to colonoscopy and diagnosis was confirmed by histopathology in 21 cases. Most affected by CRC were the colon (62.5%) and rectum (37.5%), and no lesions were found in the anus or anal canal. The left colon was the most affected (75%), with 58.33% of the lesions in the sigmoid region; and 25% of lesions were found in the right colon. Conclusion: The Kappa index of diagnostic agreement for this sample in the detection of colorectal cancer was 0.88 with CI 0.78 and 0.98, considered substantial.
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