title: Vestibular schwannoma mimicking horizontal cupulolithiasis.
abstract: Positional vertigo and nystagmus can be due to canalithiasis, cupulolithiasis and less commonly, an underlying peripheral or central vestibular disorder. We present a patient with vestibular schwannoma who initially sought treatment for positioning vertigo. Video-oculography on the roll-test revealed direction-changing horizontal apogeotropic nystagmus, consistent with horizontal cupulolithiasis. However, further audio-vestibular investigations and imaging confirmed a right vestibulopathy attributable to a schwannoma of the right vestibular nerve. This case report suggests that vestibular schwannoma should be considered as another potential mimicker of horizontal cupulolithiasis.
authors.affiliation: Institute of Clinical Neurosciences, Royal Prince Alfred Hospital, Central Clinical School, University of Sydney, New South Wales 2050, Australia.
authors.forename: Rachael L
authors.initials: RL
authors.lastname: Taylor
authors.forename: Luke
authors.initials: L
authors.lastname: Chen
authors.forename: Corinna
authors.initials: C
authors.lastname: Lechner
authors.forename: Swee T
authors.initials: ST
authors.lastname: Aw
authors.forename: Miriam S
authors.initials: MS
authors.lastname: Welgampola
mesh_terms: D003937:Diagnosis, Differential; D006801:Humans; D020347:Lithiasis / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged; D009464:Neuroma, Acoustic / Q000150:complications / Q000175:diagnosis*; D009759:Nystagmus, Pathologic / Q000175:diagnosis* / Q000209:etiology; D012027:Reflex, Vestibulo-Ocular / Q000502:physiology; D014717:Vertigo / Q000175:diagnosis* / Q000209:etiology
keywords: Cupulolithiasis; Horizontal apogeotropic nystagmus; Positional vertigo; Vestibular schwannoma