PURPOSE: The authors assessed the adequacy and sensitivity of CT-guided bone biopsy in 308 procedures performed in 286 cancer patients with suspected bone metastases. MATERIALS AND METHODS: An electronic search of our CT-guided bone biopsy database was retrospectively performed to evaluate the adequacy of samples and, in the event of negative samples, whether the patients had radiological progression at the site of biopsy (false negative). Adequacy and false-negative rate were compared with radiological features, biopsy location, specimen length and complications to assess any statistically relevant association with a multivariate logistic regression model. RESULTS: A total of 290/308 (94.1 %) samples were adequate. Forty-five patients had normal bone marrow and were followed-up, with evidence of progression at the site of biopsy in 10 cases (false-negative cases); overall sensitivity was 96.7 %. Specimen length was significantly correlated to the probability of an adequate biopsy (p = 0.035) and inversely correlated to the probability to obtain a false-negative result (p = 0.02). We encountered 11/308 (3.5 %) minor complications and no major complications. CONCLUSION: CT-guided biopsy of bone lesions in cancer patients allows for a final diagnosis in 94 % of cases. A specimen longer than 1 cm may lead to a significant result in terms of adequacy and sensitivity. Negative biopsies with positive positron emission tomography or magnetic resonance imaging and specimen shorter than 1 cm should be repeated to avoid a false-negative result.
PURPOSE: The authors assessed the adequacy and sensitivity of CT-guided bone biopsy in 308 procedures performed in 286 cancerpatients with suspected bone metastases. MATERIALS AND METHODS: An electronic search of our CT-guided bone biopsy database was retrospectively performed to evaluate the adequacy of samples and, in the event of negative samples, whether the patients had radiological progression at the site of biopsy (false negative). Adequacy and false-negative rate were compared with radiological features, biopsy location, specimen length and complications to assess any statistically relevant association with a multivariate logistic regression model. RESULTS: A total of 290/308 (94.1 %) samples were adequate. Forty-five patients had normal bone marrow and were followed-up, with evidence of progression at the site of biopsy in 10 cases (false-negative cases); overall sensitivity was 96.7 %. Specimen length was significantly correlated to the probability of an adequate biopsy (p = 0.035) and inversely correlated to the probability to obtain a false-negative result (p = 0.02). We encountered 11/308 (3.5 %) minor complications and no major complications. CONCLUSION: CT-guided biopsy of bone lesions in cancerpatients allows for a final diagnosis in 94 % of cases. A specimen longer than 1 cm may lead to a significant result in terms of adequacy and sensitivity. Negative biopsies with positive positron emission tomography or magnetic resonance imaging and specimen shorter than 1 cm should be repeated to avoid a false-negative result.
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