Mixed carcinomas in the esophagus are highly uncommon neoplasms that represent a diagnostic challenge on small tissue biopsies. We present a case of a primary mixed sarcomatoid–small cell carcinoma of the esophagus that was diagnosed after repeat sampling of the lesion. The components were morphologically distinct and could be further classified by immunohistochemistry. Next-generation sequencing identified mutations in PIK3CA and CDKN2A. The small cell component morphology was also identified in brain metastasis.
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