Well-differentiated Astroblastoma with Both Focal Anaplastic Features and a Meningioma 1 Gene Alteration

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  • Fudaba Hirotaka
    Department of Neurosurgery, Oita University Faculty of Medicine, Yufu, Oita, Japan
  • Momii Yasutomo
    Department of Neurosurgery, Oita University Faculty of Medicine, Yufu, Oita, Japan
  • Kawasaki Yukari
    Department of Neurosurgery, Oita University Faculty of Medicine, Yufu, Oita, Japan
  • Goto Hironori
    Department of Pediatrics, Oita University Faculty of Medicine, Yufu, Oita, Japan
  • Nobusawa Sumihito
    Department of Human Pathology, Gunma University Graduate School of Medicine, Maebashi, Gunma, Japan
  • Fujiki Minoru
    Department of Neurosurgery, Oita University Faculty of Medicine, Yufu, Oita, Japan

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<p>A 6-year-old female was incidentally found to have a brain tumor. Magnetic resonance imaging (MRI) demonstrated a gadolinium-enhanced mass in the left parietal lobe. We performed gross total resection with the assistance of fluorescent guidance by 5-aminolevulinic acid (5-ALA). A histological examination of the tumor specimen showed well-differentiated astroblastic features with focal anaplasia. Fluorescence in situ hybridization (FISH) revealed meningioma 1 (MN1) gene alteration and supported our diagnosis. She received local radiotherapy and oral temozolomide followed by maintenance temozolomide chemotherapy, and the tumor was well controlled without any neurological deficit for 27 months. Our case is considered to be valuable since it describes a patient who is diagnosed to have a well-differentiated astroblastoma with both focal anaplastic features and MN1 gene rearrangement. A larger study is warranted to establish evidence supporting the diagnosis and treatment of astroblastoma with molecular characteristic features. MN1 alteration will be a diagnostic marker for astroblastoma in the future.</p>

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