SMARCB1 and atypical teratoid rhabdoid tumor: In a series of 102 ATRT samples (Table 1), distinct cytoplasmic SMARCB1 staining was encountered in 19 cases (19%) using immunohistochemistry and a commercial mouse monoclonal antibody (BAF47) raised against amino acids 257–359 of SMARCB1 (ENST00000644036.2), which is commonly used in the diagnostic setting [19, 26, 27] (Fig. 1a–c).