neuroendocrine carcinoma (Monarch Disease Ontology identifier MONDO_0002120) is a malignant neuroendocrine neoplasm composed of cells containing secretory granules that stain positive for NSE and chromogranin. The neoplastic cells are often round and form clusters or trabecular sheets. Representative examples are small cell carcinoma, large cell neuroendocrine carcinoma, and Merkel cell carcinoma. Also known as: NEC, neuroendocrine cancer.