FGF14 and bile duct papillary neoplasm: GAA expansions in FGF14 were recently identified as a common cause of late-onset dominant ataxia worldwide.63 64 Mild peripheral neuropathy was reported as part of the phenotype in approximately 11–25% of patients, but was not a core feature.63 65 66 Some studies reported no neuropathic features in GAA-FGF14 positive cases.64 67 68 Whether IPN is a consistent feature of GAA-FGF14-related ataxia remains to be clarified.