%0 Journal Article
%T Nystagmus in patients with lateral semicircular canal dysplasia.
%A Choi B
%A Lee DH
%A Shin JE
%A Kim CH
%J Acta Otolaryngol
%V 140
%N 12
%D Dec 2020
%M 32808842
%F 1.698
%R 10.1080/00016489.2020.1804615
%X <B>BACKGROUND: </B>Dizziness is not a common symptom in the lateral semicircular canal (LSCC) dysplasia, and nystagmus findings has been rarely described in LSCC dysplasia.<BR><B>OBJECTIVE: </B>To investigate the characteristics of spontaneous and positional nystagmus in patients with LSCC dysplasia.<BR><B>METHODS: </B>Patterns of spontaneous and positional nystagmus of twelve patients with LSCC dysplasia, who visited our clinic with a chief complaint of dizziness, were investigated.<BR><B>RESULTS: </B>LSCC dysplasia was observed unilaterally in 4, and bilaterally in 8 patients. Non-rotatory dizziness with various onset times was the most common description of dizziness, and unilateral caloric weakness was observed in 82% of patients. Direction-fixed nystagmus, in which the direction of spontaneous nystagmus was same with that of positional nystagmus, was observed in 9 patients, and direction-changing positional nystagmus, in which the direction of nystagmus was changed from that of spontaneous nystagmus by positioning maneuvers, was observed in 3 patients, of whom down-beating or direction-changing spontaneous nystagmus was observed in one patient each.<BR><B>CONCLUSIONS: </B>While direction-fixed horizontal nystagmus is the most commonly observed type of nystagmus in LSCC dysplasia, atypical spontaneous nystagmus, such as down-beating nystagmus or direction-changing spontaneous nystagmus, may be observed in patients with bilateral LSCC dysplasia.