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New Observations on a Low‐Grade Diffusely Infiltrative Tumour, SMARCB1 Mutant, Arguing for a New Tumour Type

Alice Métais, Giorgia Antonia Simboli, Marc Barritault, Fabrice Chrétien and 10 more

Neuropathology and Applied Neurobiology | Sep 7, 2026

Abstract

Abstract

Two new cases of low-grade diffusely infiltrative tumour (LGDIT), SMARCB1 mutant, are described in an 18-year-old and a 50-year-old male, both with supratentorial lesions, characteristic rhabdoid histology on a myxoid-collagenous background, and complete INI1 loss. Both tumours showed homozygous SMARCB1 deletion and clustered with previously reported LGDIT on t-SNE analysis, in proximity to ATRT-MYC. These observations reinforce the distinct clinicopathological profile of LGDIT and support its consideration as a provisional CNS tumour type.

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Authors

Researchers on this paper

Alice Métais

first | Université Paris Cité | ORCID 0000-0002-5924-3555

Giorgia Antonia Simboli

middle | University Hospital of Geneva | ORCID 0000-0002-2377-9470

Marc Barritault

middle | Hospices Civils de Lyon | ORCID 0000-0003-3311-4058

Fabrice Chrétien

middle | Université Paris Cité

Julien Masliah‐Planchon

middle | Institut Curie

Alessandro Moiraghi

middle | Centre Hospitalier Sainte-Anne | ORCID 0000-0003-4569-5304

Johan Pallud

middle | Centre Hospitalier Sainte-Anne | ORCID 0000-0002-1652-9844

Laure Thomas

middle | Hospices Civils de Lyon

Pierre Leblond

middle | Centre National de la Recherche Scientifique | ORCID 0000-0002-7088-2614

Alexandre Bani‐Sadr

middle | Hospices Civils de Lyon | ORCID 0000-0002-1808-2484

Raphaël Saffroy

middle | Hôpital Paul-Brousse | ORCID 0000-0002-9878-3669

Arnault Tauziède‐Espariat

middle | Inserm | ORCID 0000-0002-9979-0297

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BibTeX

@article{Mtais2026Observations,
  title = {New Observations on a Low‐Grade Diffusely Infiltrative Tumour, SMARCB1 Mutant, Arguing for a New Tumour Type},
  author = {Alice Métais and Giorgia Antonia Simboli and Marc Barritault and Fabrice Chrétien and Julien Masliah‐Planchon and Alessandro Moiraghi and Johan Pallud and Laure Thomas and Pierre Leblond and Alexandre Bani‐Sadr and Raphaël Saffroy and Arnault Tauziède‐Espariat and Alexandre Vasiljevic and Pascale Varlet},
  journal = {Neuropathology and Applied Neurobiology},
  year = {2026},
  doi = {10.1111/nan.70098},
  url = {https://doi.org/10.1111/nan.70098}
}

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