In addition to SMARCA4-dNSCC, the clinicoradiologic, morphologic, and/or immunophenotypic features of thoracic SMARCA4-dUT are similar to those of other malignancies including neuroendocrine carcinomas, mesotheliomas, and some sarcomas (3–5). The gene discussed is SMARCA4; the disease is neuroendocrine carcinoma.