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A Case of Post-traumatic WLF Syndrome Shoji TAKANO 1,5 , Masataka ENDOH 1 , Yoshio MIYASAKA 1 , Takashi OHWADA 2 , Kazuo MUKUNO 3 , Hiroshi TAKAGI 4 1Department of Neurosurgery, Kitasato University School of Medicine 2Department of Critical Care Medicine, Kitasato University School of Medicine 3Department of Ophthalmology, Kitasato University School of Medicine 4Department of Neurosurgery, Yamato City Hospital Keyword: Head injury , Brain stem , Medial longitudinal fasciculus(MLF)syndrome pp.963-967
Published Date 1991/10/10
DOI https://doi.org/10.11477/mf.1436900339

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  • Abstract
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Abstract

Medial longitudinal fasciculus (MLF) syndrome re-cognized 2 days after a head injury is described.

The patient was a 48-year-old man who had fallenfrom a ladder about 3m high. On his admission, scalp contusion on the left occipital area was noticed. Neuro-logical examination revealed no neurological abnormali-ties except slightly disturbed consciousness. Plain skull X-ray films demonstrated a lineal skull fracture of the left occipital bone. Computed tomographic (CT) scans showed a slight subarachnoid hemorrhage within the bilateral sylvian fissures, but no parenchymal contusion in the brain stem was observed. On the 2nd day, when the patient regained full consciousness, impairment of adduction of the right eye and a fine nystagmus of the left eye on left lateral gaze were recognized. Conver-gence was intact. Right side MLF syndrome was dia-gnosed. This syndrome gradually disappeared followed by the initial improvement of adduction of the right eye, and the patient had completely recovered about 20 days after the head injury.

Three major mechanisms leading to MLF syndrome caused by head injury are reported in the literature. They are :① primary brain stem injury,② secondary brainstem injury by trans-tentorial herniation, and ③ circulatory disturbance of perforating branches of the vertebro-basilar artery due to shearing force. In our case, the slightly disturbed consciousness at the time of the head injury indicates that this syndrome was not brought on by primary or secondary brain stem injury. The scalp contusion and lineal skull fracture in the left occipital area suggests that the trauma force may have heen transmitted in a longitudinal direction from post-erior to anterior, and shearing strain may have dam-aged the circulation system of perforating branches of the vertebro-basilar artery which supply the area of MLF in the brain stem.


Copyright © 1991, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1251 印刷版ISSN 0301-2603 医学書院

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