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SMARCB1-deficient sinonasal carcinoma. A Most cases have a basaloid low-power appearance. Bone invasion is common. B A minority of cases have a “pink” cell appearance, where the tumor cells are somewhat plasmacytoid, with hyaline-appearing cytoplasm. C Rare cases show glandular or even yolk sac-like differentiation. D A complete loss of SMARCB1 expression by immunohistochemistry defines this tumor. Note the retained staining in lymphocytes, a helpful internal control
