Choline C 11 Injection is indicated for positron emission tomography imaging of patients with suspected prostate cancer recurrence and non-informative bone scintigraphy, computerized tomography or magnetic resonance imaging . In these patients, 11 C-choline PET imaging may help identify potential sites of prostate cancer recurrence for subsequent histologic confirmation. Suspected prostate recurrence is based upon elevated blood prostate specific antigen levels following initial therapy. In clinical studies, images were produced with PET/CT coregistration. Limitation of U se: 11 C-choline PET imaging is not a replacement for histologic verification of recurrent prostate cancer. Choline C 11 Injection is a radioactive diagnostic agent for positron emission tomography imaging of patients with suspected prostate cancer recurrence and non-informative bone scintigraphy, computerized tomography or magnetic resonance imaging. In these patients, 11 C-choline PET imaging may help identify potential sites of prostate cancer recurrence for subsequent histologic confirmation. Suspected prostate recurrence is based upon elevated blood prostate specific antigen levels following initial therapy. In clinical studies, images were produced with PET/CT coregistration. Limitation of U se: 11 C-choline PET imaging is not a replacement for histologic verification of recurrent prostate cancer .