This led to the identification of 4 sinonasal entities driven by SWI/SNF deficiency complexes: SMARCB1 (INI1)-deficient sinonasal carcinoma (lacking gland formation and frequently displaying a non-descript basaloid and less frequently eosinophilic/oncocytoid morphology), SMARCB1-deficient sinonasal adenocarcinoma with unequivocal glands or yolk sac-like pattern, SMARCA4-deficient carcinoma lacking glandular or squamous immunophenotypes, and SMARCA4-deficient subset (~ 80%) of sinonasal teratocarcinosarcoma [6]. The gene discussed is SMARCA4; the disease is carcinoma.