NF2 and schwannomatosis: While the majority of NF2 mutations were nonsense mutations in both groups, there were significant differences in the mutation types (p = 0.0459) with in-frame deletions only being detected in patients with NF2-related schwannomatosis (n = 1, 12.5%) and frameshift mutations only found in SP-EPN from patients without known NF2 (n = 12, 27%; Fig. 2e).