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MRI Features Can Predict 1p/19q Status in Intracranial Gliomas.

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Summary
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Magnetic Resonance (MR) imaging features can predict 1p/19q codeletion status in oligodendroglioma. A T2-FLAIR mismatch suggests no codeletion, while calcifications indicate codeletion, aiding diagnosis when genetic testing is unavailable.

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Area of Science:

  • Neuro-oncology
  • Neuroradiology
  • Molecular Pathology

Background:

  • The 2016 World Health Organization Classification of Tumors of the Central Nervous System requires 1p/19q codeletion for oligodendroglioma diagnosis.
  • Conventional MR imaging features may predict 1p/19q codeletion status.

Purpose of the Study:

  • To investigate the ability of conventional MR imaging features to predict 1p/19q codeletion status in gliomas.
  • To assess the diagnostic accuracy of MR imaging findings compared to genetic testing.

Main Methods:

  • Retrospective analysis of preoperative MR imaging in 69 patients with known 1p/19q status.
  • Two neuroradiologists assessed 13 MR imaging features, blinded to genetic status.
  • Features were initially assessed in a small cohort and validated in a larger group.

Main Results:

  • Radiologists achieved 85% agreement and 84% accuracy in predicting 1p/19q status.
  • >50% T2-FLAIR mismatch showed 100% specificity for noncodeleted tumors (P = .001).
  • Calcifications were present in 7 tumors, with 6 being 1p/19q codeleted (97% specificity, P = .006).

Conclusions:

  • A >50% T2-FLAIR mismatch on MR imaging strongly predicts a noncodeleted tumor.
  • Calcifications on MR imaging suggest a 1p/19q codeleted tumor.
  • Combining MR imaging with histology may enhance diagnostic accuracy when genetic testing is not feasible.