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The current classification of sinonasal tumors with neuroendocrine differentiation (STND). SNET sinonasal neuroendocrine tumors, ScNEC small cell neuroendocrine carcinoma, SNUC sinonasal undiffererentiated carcinoma, LCNEC large cell neuroendocrine carcinoma, ONB olfactory neuroblastoma (low-grade and high-grade)
