SMARCB1 expression is completely absent in both PDC and atypical teratoid/rhabdoid tumor (AT/RT), and TBXT and cytokeratin immunoexpressions of PDC are diffuse and strong, and combining SMARCB1 with TBXT staining helps to distinguish PDC from AT/RT [39]. Here, SMARCB1 is linked to ataxia telangiectasia.