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  • Title: Diagnostic accuracy of serial CT/magnetic resonance imaging review vs. positron emission tomography/CT in colorectal cancer patients with suspected and known recurrence.
    Author: Potter KC, Husband JE, Houghton SL, Thomas K, Brown G.
    Journal: Dis Colon Rectum; 2009 Feb; 52(2):253-9. PubMed ID: 19279420.
    Abstract:
    PURPOSE: This study examined the sensitivity and specificity of CT/magnetic resonance imaging serial review compared to fluoro-2-deoxy glucose positron emission tomography-CT scanning to optimize colorectal cancer follow-up. PATIENTS AND METHODS: Using standardized proformas, three blinded radiologists reviewed serial CT and magnetic resonance imaging in suspected cases of colorectal cancer recurrence in patients undergoing fluoro-2-deoxy glucose positron emission tomography-CT imaging. RESULTS: Fifty eligible patients were included in the review. On follow-up, 23 patients had positive and 27 patients had negative diagnoses for colorectal cancer recurrence. Serial imaging review reduced the number of equivocal studies from 20 to 4 and unexplained carcinoembryonic antigen elevations from 17 to 10. Using fluoro-2-deoxy glucose positron emission tomography-CT, the number of equivocal studies reduced from 20 to 6 and unexplained carcinoembryonic antigen elevations reduced from 17 to 10. Fluoro-2-deoxy glucose positron emission tomography-CT altered management in 8 percent of patients (4/50, 95 percent CI, 0-16 percent). No significant differences were found between accuracy, sensitivity and specificity upon comparison of serial imaging review and fluoro-2-deoxy glucose positron emission tomography-CT in detecting recurrent disease. Extra information was demonstrated on 18 fluoro-2-deoxy glucose positron emission tomography-CT compared to serial imaging review in 8 of 50 patients and one patient had a positive incidental finding. CONCLUSIONS: With suspected recurrence, we recommend undertaking serial imaging review with careful correlation of suspicious findings with previous studies. Fluoro-2-deoxy glucose positron emission tomography-CT imaging was useful when findings remain equivocal after serial imaging review for colorectal cancer recurrence.
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