SMARCB1 and malignant myoepithelioma: SMARCB1-deficient sinonasal adenocarcinoma needs to be distinguished from several mimics including mainly high-grade intestinal and non-intestinal adenocarcinoma, as well as myoepithelial carcinoma, primary and metastatic yolk sac tumor, and metastatic hepatoid adenocarcinoma from the digestive system and other sites.