Visual suppression tests in acoustic neuroma patients.
Fifty-five patients with a unilateral acoustic neuroma were investigated preoperatively with visual suppression tests during rotatory oscillation and caloric irrigation. During a sinusoidal oscillation, 29% of the patients showed a reduced suppression compared to 9% during pseudo-random oscillation and 11% in the caloric test. In the sinusoidal and caloric tests the majority of the patients with deficient suppression had large or medium-sized tumors. In a few patients with small tumors, pathology was observed in both sinusoidal and randomized tests, presumably as a sign of unconcentration. The study shows that the sinusoidal visual suppression test and to a lesser degree suppression during caloric irrigation are of value for identification of brainstem-cerebellum compression of acoustic neuromas.
Hydén
D
D
Department of Otolaryngology, Linköping University, Sweden.
Larsby
B
B
Odkvist
L M
LM
Möller
C
C
D000328:Adult; D000368:Aged; D002150:Caloric Tests; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009464:Neuroma, Acoustic / Q000175:diagnosis*; D009760:Nystagmus, Physiologic; D012399:Rotation; D014724:Vestibular Function Tests; D014795:Visual Pathways / Q000503:physiopathology*