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STUDIES ON THE DISTANT RHYTHM IN THE POSTERIOR FOSSA TUMORS : CORRELATION BETWEEN THE DISTANT RHYTHM, INCREASED INTRACRANIAL PRESSURE AND NEURO-RADIOLOGICAL FINDINGS Katsuzo Fujita 1 , Seiya Shirakata 1 , Satoshi Matsumoto 1 1Dept. of Neurosurgery, Kobe University, School of Medicine pp.1029-1037
Published Date 1975/9/1
DOI https://doi.org/10.11477/mf.1406203775
  • Abstract
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E. E. G. was taken in 31 cases of posterior fossatumors, varified at operation or autopsy. Distantrhythm, classified by Dr. Fraue, was analysed onthe basis of clinical and neuroradiological data.

1) Abnormal E. E. G.'s were found in 24 casesof the 31 cases (77%). This abnormal E. E. G. wasmost frequently found in the cerebellar tumors andalso malignant tumors in the posterior fossa, un-related to their location and least frequently foundin the cerebello-pontine angle tumors.

2) Lateralizing signs in the E. E. G. were foundto be no reliable.

3) E. E. G.'s were taken in 8 cases with increasedintracranial pressure after and before ventriculo-peritoneal shunts. Monorhythmic or polymorphicdelta waves disappeared in most cases of benignposterior fossa tumors, but persisted in cases ofmalignant tumors after ventriculo-peritoneal shunts.

4) Degree of hydrocephalus and shift of IV thventricle obtained in air study did not correlatewith E. E. G. abnormality and distant rhythm.

5) Pressure increase in the III rd ventricle andedema of the brain stem occupy a key position asa pathogenetic mechanism for distant rhythm.


Copyright © 1975, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 2185-405X 印刷版ISSN 0006-8969 医学書院

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