Postoperative Normalization of Prolonged P100m Latency in the Visual Evoked Magnetic Field in a Patient with Occipital Meningioma Akitake Kanno 1,2 , Nobukazu Nakasato 2 , Kaoru Seki 2 , Keisaku Hatanaka 3 , Kazuo Mizoi 2 , Takashi Yoshimot 2 1MEG Laboratory, Kohnan Hospital 2Department of Neurosurgery, Tohoku University School of Medicine 3Kansai Research Institute Keyword: magnetoencephalography , visual evoked response , functional brain map , meningioma , occipital lobe pp.373-376
Published Date 1997/4/1
DOI https://doi.org/10.11477/mf.1406901097
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A 49-year-old female with a left occipital para-sagittal meningioma was found to have prolonged P100m latency of the pattern reversal visual evoked magnetic field only in the hemisphere containing the lesion. After total removal of the tumor, the P100m latency was normalized in the affected hemisphere. Based on current dipole models, all the P100m dipoles were localized at the lateral bottom of the calcarine fissures bilaterally, as indicated by our previous study with normal subjects.

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