KLK3 and posterior cortical atrophy: Choline-based PET/CT, both [11C]- and [18F]-labeled choline derivates, has been the most extensively studied as a promising molecular imaging modality for the evaluation of PCa with BR, proving both higher sensitivity and specificity than CIM in detecting relapse or metastatic spread, in relation to the PSA level and its kinetics (7, 8).