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SMARCB1 Deficient carcinoma. a SMARCB1-deficient sinonasal carcinomas typically grow as nests and cords of undifferentiated cells. b Some cases exhibit prominent plasmacytoid or rhabdoid morphology. c Other examples are more basaloid in appearance, with only focal plasmacytoid/rhabdoid features (center). d By definition, these tumors demonstrate a complete absence of SMARCB1 immunoreactivity, with the background stromal and inflammatory cells showing intact staining
