FGF14 and multiple system atrophy: Furthermore, downbeat nystagmus and oscillopsia are frequent in SCA27B.12,29 However, in our study, horizontal nystagmus and interrupted saccades were the only ocular motor signs reported in the FGF14 GAA-positive MSA cases, most probably related to incomplete data reporting, because these features in most cases were reviewed post-mortem from clinical notes.