Case series reports distinct molecular profiles in low-grade diffusely infiltrative SMARCB1-mutant brain lesions in two male patients, supporting their classification as a distinct CNS tumour type.
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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Métais et al. (2026) studied this question.
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