FGFR3 and choroid plexus papilloma: The HBL tumor of this study exhibited exon 25 and exon 9 mutations in ALK and FGFR3 genes (Table 3); however, mutations in exon 29 and exon 16 in these two genes were previously reported in an atypical-choroid plexus papilloma (a-CPP) tumor [21].