Premature Reversal Caloric Nystagmus in a Patient withMedulloblastoma, Originated from the 4th Ventricle

J Korean Neurol Assoc > Volume 18(6); 2000 > Article

Journal of the Korean Neurological Association 2000;18(6): 794-797.

조기 역전성 온도 안진을 보이는 제4뇌실의 수모세포종 1예

이형, 이장준 ·장상섭 ·이승환*·임정근 ·이상도 ·박영춘

계명대학교 의과대학 신경과학교실,마산삼성병원 신경과학교실*

Premature Reversal Caloric Nystagmus in a Patient withMedulloblastoma, Originated from the 4th Ventricle

Hyung Lee, M.D., Jang Joon Lee, M.D., Sang Sub Jang, M.D., Seung-Hwan Lee, M.D.*,Jeong-Geun Lim, M.D., Sang-Doe Yi, M.D., Young-Choon Park, M.D.

Department of Neurology, Keimyung University, School of MedicineDepartment of Neurology, Masan Samsung Hospital*

Abstract

Some individuals may demonstrate a secondary phase nystagmus (SPN) following the caloric irrigation. It has been stated that if a SPN begins prior to 140 seconds after the onset of caloric stimulation and if the magnitude of the slow phase velocity is greater than 6°/sec, then a premature reversal caloric nystagmus (PRCN) is said to exit. Thus far, there have been no reports describing PRCN in Korea. We described a typical PRCN in a patient with medulloblastoma with-in the 4th ventricle. The patient had a gaze-evoked horizontal and up-beating nystagmus. However, there was no indica-tion of spontaneous nystagmus. A monothermal caloric test was administered. The initial left beating primary phase nystagmus was subsided at 60 seconds after right cold water stimulation and at 110 seconds, a right beating SPN with 14°/sec of slow phase velocity was appeared and was continuous for 240 seconds. Although the precise mechanism of PRCN is unknown, vestibular nuclei damage may be related.J Korean Neurol Assoc 18(6):794~797, 2000Key Words : Second phase nystagmus, Caloric stimulation, Premature reversal caloric nystagmus, Medullobalstoma