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SMARCB1 (INI1)–deficient sinonasal carcinoma. A, The carcinoma has basaloid morphology with hyperchromatic-to-vesicular chromatin and occasional prominent nucleoli. B, Tumor shows complete loss of SMARCB1 by immunohistochemistry (hematoxylin-eosin, original magnification ×40 [A]; original magnification ×40 [B]).
