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<p>Myxoid glioneuronal tumor (MGT) is a newly delineated CNS WHO grade 1 neoplasm genetically characterized by PDGFRA p.K385L/I mutation. We describe a 14-year-old boy presenting with gelastic seizures caused by an intraventricular MGT. Intraoperative frozen section allowed minimal resection, preserving surrounding eloquent structures. Histology showed oligodendrocyte-like cells within myxoid stroma and scattered floating neurons, while molecular analysis revealed the canonical PDGFRA p.K385L mutation. At 13-month follow-up, the residual tumor remained stable without any further neurological dysfunction. This case highlights the importance of intraoperative diagnosis for surgical safety in MGT.</p>

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Intraoperative diagnosis of myxoid glioneuronal tumor guiding safe limited resection: a case report

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年8月1日

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  • Kazuya Morita,
  • Yoshio Nakashima,
  • Nozomu Kurose,
  • Atsuhiro Kawashima,
  • Akihiro Nishiyama,
  • Hironori Fujisawa

摘要

Myxoid glioneuronal tumor (MGT) is a newly delineated CNS WHO grade 1 neoplasm genetically characterized by PDGFRA p.K385L/I mutation. We describe a 14-year-old boy presenting with gelastic seizures caused by an intraventricular MGT. Intraoperative frozen section allowed minimal resection, preserving surrounding eloquent structures. Histology showed oligodendrocyte-like cells within myxoid stroma and scattered floating neurons, while molecular analysis revealed the canonical PDGFRA p.K385L mutation. At 13-month follow-up, the residual tumor remained stable without any further neurological dysfunction. This case highlights the importance of intraoperative diagnosis for surgical safety in MGT.