The pooled prevalence of NIFTP cases among 24,384 cases from 19 studies which had included either all resections or FNA diagnosed samples available in their study population. The results show that NIFTP consisted 4.4% (95% CI from 3.5% to 5.4%) of all surgically resected cases. I² (inconsistency index) was 97%. NIFTP, non-invasive follicular thyroid neoplasm with papillary-like nuclear features; FNA, fine needle aspiration; CI, confidence interval.