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Rosette-forming glioneuronal tumor: pathology case report.

José Pimentel1, Mário Resende, Artur Vaz

  • 1Department of Neurology, Laboratory of Neuropathology, Institute of Molecular Medicine, Hospital de Santa Maria, Lisbon Faculty of Medicine, Lisbon, Portugal. josepimentel@fm.ul.pt

Neurosurgery
|June 27, 2008
PubMed
Summary

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Rosette-forming glioneuronal tumors are rare, low-grade mixed glial and neuronal neoplasms. Characterization of these tumors aids in differentiating them from other glioneuronal tumors.

Area of Science:

  • Neuro-oncology
  • Neuropathology

Background:

  • Rosette-forming glioneuronal tumor (RGNT) is a newly described entity characterized as a mixed glial and neuronal neoplasm.
  • This study aims to better characterize RGNT by describing two cases and reviewing existing literature.

Observation:

  • Two female patients, aged 38 and 51, presented with neurological symptoms and intracranial masses.
  • Magnetic resonance imaging revealed masses in the fourth ventricle and cerebellum.
  • Surgical excision, either subtotal or gross total, was performed with varying degrees of transient morbidity.

Findings:

  • Microscopic examination confirmed RGNTs composed of neurocytic rosettes and glial fibrillary acidic protein-positive astrocytes.
  • No histological anaplasia was observed in either case.

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  • Eighteen cases of RGNT were identified in the literature search, with patients ranging from 12 to 59 years old.

    • Implications:

    • RGNTs are typically low-grade tumors of young adulthood, often located near the fourth ventricle.
    • Imaging reveals cystic and/or solid components with minimal mass effect.
    • Understanding the distinct histological and imaging features of RGNT is crucial for differential diagnosis among glioneuronal tumors.