TITLE:
A 7-Year-Old Boy with Light Cupula of the Horizontal Semicircular Canal
AUTHORS:
Hiroaki Ichijo
KEYWORDS:
Light Cupula; Positional Nystagmus; Child; Video-Oculography
JOURNAL NAME:
International Journal of Otolaryngology and Head & Neck Surgery,
Vol.3 No.2,
March
27,
2014
ABSTRACT: Report of childhood
positional vertigo is very rare. We present a 7-year-old boy who revealed persistent
direction-changing geotropic positional nystagmus. In the supine position,
horizontal nystagmus toward the left continued as long as
the position was maintained. However, it ceased when the head was turned to the
right side by 45°. With greater head
turn (right-ear-down), nystagmus toward the right lasted for more than 1
minute. In the left-ear-down position, horizontal nystagmus
toward the left occurred and lasted for more than 1 minute. After the disappearance
of positional nystagmus, we detected canal paresis of
the right ear by caloric test. We considered that the pathophysiology of the
persistent type of geotropic nystagmus is a result of light debris cupulolithiasis
of the horizontal canal.