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Triphasic waves and cerebral tumors.

U Aguglia1, A Gambardella, R L Oliveri

  • 1Institute of Neurological Sciences, University of Reggio Calabria, Faculty of Medicine, Catanzaro, Italy.

European Neurology
|January 1, 1990
PubMed
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Triphasic waves (TW) on electroencephalograms, typically linked to metabolic issues, can also appear in brain tumors affecting midline structures. Their presence or absence correlates with treatment outcomes in these cases.

Area of Science:

  • Neurology
  • Neurophysiology
  • Oncology

Background:

  • Triphasic waves (TW) are commonly associated with diffuse brain dysfunction, such as metabolic encephalopathies.
  • Their presence in focal brain lesions, particularly tumors, is less understood.

Observation:

  • Three patients with diencephalic midline tumors (gliomas, craniopharyngioma) without metabolic abnormalities presented with disorientation or coma.
  • Electroencephalograms (EEGs) in these patients revealed characteristic triphasic waves.

Findings:

  • The study demonstrates that triphasic waves can manifest in patients with brain tumors involving subcortical midline structures.
  • Persistence or disappearance of TW correlated with the efficacy of antiedema treatment and patient outcomes.

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Implications:

  • This finding expands the differential diagnosis for triphasic waves beyond metabolic causes to include specific brain tumor locations.
  • Monitoring TW may offer prognostic value in patients with midline diencephalic tumors undergoing treatment.