FOLH1 and posterior cortical atrophy: Several radiotracers may be employed in the functional imaging of oligometastatic PCa, namely, 18 fluoro-2-D-deoxyglucose ([18F]-FDG), 11C-acetate [43], 11C-choline, 18F-choline, 18F-acetate [44], 18F-fluciclovine (also known as FACBC) [45], 68Ga-PSMA-11 [46], dihydrotestosterone-based radiotracers such as 16b-18F-fluoro-5a-dihydrotestosterone [47] and radiolabeled bombesin receptor antagonists that target gastrin-releasing peptide receptors [48], as well as other receptor-binding molecules (Table 3) [49,50,51].