“…8 Despite screening procedures, the available data reporting BIU detected by 18 F-FDG-PET or PET/CT suggest that some lesions are still missed during traditional screening work-up. [9][10][11][12][13][14][15][16][17][18][19][20][21][22] When a BIU is detected, it creates for a management dilemma requiring further investigations. Overall, the prevalence of BIU on all scan ranges from 0.11% to 0.83%, with pooled estimate of 0.40%; the prevalence of BIU on scans performed on female patients only ranges from 0.36% to 1.84%, with pooled estimate of 0.82%; the pooled malignancy risk of BIU who undergo further investigations ranges from 18% to 100% with pooled estimate of 48%; the pooled malignancy risk of BIU who undergo histological examination ranges from 51% to 100% with pooled estimate of 60%.…”