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024 7 _ |a 10.1093/neuonc/noae269
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041 _ _ |a English
082 _ _ |a 610
100 1 _ |a Schmid, Simone
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245 _ _ |a VGLL-fusions define a new class of intraparenchymal CNS schwannoma.
260 _ _ |a Oxford
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|b Oxford Univ. Press
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500 _ _ |a 2025 May 15;27(4):1031-1045
520 _ _ |a Intracerebral schwannomas are rare tumors resembling their peripheral nerve sheath counterparts but localized in the CNS. They are not classified as a separate tumor type in the 2021 WHO classification. This study aimed to compile and characterize these rare neoplasms morphologically and molecularly.We analyzed 20 tumor samples by histology, RNA Next-Generation Sequencing, DNA-methylation profiling, copy number analyses, and single nucleus RNA sequencing (snRNA-seq). Clinical data, including age, sex, and disease progression, were collected. MRI series were included when available.All cases with tissue available for histology review (n=13) were morphologically consistent with intracerebral schwannoma, but differed in their extent of GFAP staining. All (n=20) shared DNA-methylation profiles distinct from other CNS tumors, as well as from VGLL-altered peripheral nerve sheath tumors. Most cases (n=14/17) harbored fusions of either VGLL3 or VGLL1 (CHD7::VGLL3 (n=9/17) and EWSR1::VGLL1 (n=5/17)). In two cases the presence of a VGLL3 fusion was also confirmed by CNA analyses (n=2/17). MRI (n=4) showed well-defined, nodular tumors with strong, homogeneous enhancement and no diffusion restriction. Tumors were located throughout the neuroaxis [supratentorial (n=15), infratentorial (n=4), and spinal (n=1)]. snRNA-seq of a VGLL1-fused tumor indicated VGLL1 upregulation in 28.6% of tumor cells (n=1). During median follow-up of 1.8 years (range 3 months-9 years), none of the tumors recurred (n=10).We identify and define a new benign tumor class, designated VGLL-altered intraparenchymal CNS schwannomas. These tumors feature VGLL alterations and a specific DNA-methylation profile, with schwannoma-like histopathology and CNS localization, akin to previously classified intracerebral schwannomas.
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650 _ 7 |a VGLL
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650 _ 7 |a gliofibroma
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650 _ 7 |a glioma
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650 _ 7 |a schwannoma
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650 _ 7 |a tumor
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700 1 _ |a Mirchia, Kanish
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700 1 _ |a Tietze, Anna
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700 1 _ |a Liu, Ilon
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700 1 _ |a Siewert, Christin
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700 1 _ |a Nückles, Jakob
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700 1 _ |a Schittenhelm, Jens
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700 1 _ |a Behling, Felix
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700 1 _ |a Snuderl, Matija
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700 1 _ |a Hartmann, Christian
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700 1 _ |a Brandner, Sebastian
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700 1 _ |a Paine, Simon M L
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700 1 _ |a Korshunov, Andrey
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700 1 _ |a Hasselblatt, Martin
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700 1 _ |a Coras, Roland
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700 1 _ |a Zechel, Sabrina
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700 1 _ |a Simon, Michèle
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700 1 _ |a Wilson, Yelena
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700 1 _ |a Gianno, Francesca
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700 1 _ |a Calixto-Hope, G Lucas
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700 1 _ |a Zherebitskiy, Viktor
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700 1 _ |a Kaimaktchiev, Vassil B
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700 1 _ |a Robinson, Lorraina
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700 1 _ |a Aldape, Kenneth
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700 1 _ |a Hoving, Eelco W
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700 1 _ |a Koch, Arend
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700 1 _ |a Perry, Arie
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700 1 _ |a Sahm, Felix
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700 1 _ |a Jones, David
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700 1 _ |a Capper, David
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