%0 Case Reports %T SMARCB1/INI1-deficient undifferentiated tumour of the thorax: a case report and review of the literature. %A Zagni M %A Marando A %A Negrelli M %A Lauricella C %A Motta V %A Paglino G %A Veronese S %A Valtorta E %A Bonoldi E %A Pelosi G %J Pathologica %V 116 %N 3 %D 2024 Jun %M 38979590 暂无%R 10.32074/1591-951X-955 %X The 5th WHO classification of thoracic tumours includes thoracic SMARCA4-deficient undifferentiated tumour (SMARCA4-UT) among the "other epithelial tumours of the lung" chapter. Herein, we present a case of undifferentiated thoracic neoplasm with retention of SMARCA4 expression, lack of NUT fusion protein and loss of SMARCB1/INI1 expression. After presenting the clinical and pathological features of the tumour, we carried out a review of the literature on the same topic. Albeit very rare, we believe this entity should be included in the heterogeneous group of undifferentiated neoplasms of the thorax.