*Acetates *Carbon Carbon Radioisotopes Carcinoma Transitional Cell/*diagnostic imaging/pathology *Choline Humans Likelihood Functions Lymph Nodes/*diagnostic imaging/pathology Lymphatic Metastasis Neoplasm Staging Odds Ratio Positron Emission Tomography Computed Tomography ROC Curve Sensitivity and Specificity Urinary Bladder Neoplasms/*diagnostic imaging/pathology Bladder cancer C-11 acetate C-11 choline Lymph node Pet/ct Staging