MONDO_0004116 (esophageal small cell neuroendocrine carcinoma) is an aggressive, high-grade and poorly differentiated carcinoma with neuroendocrine differentiation that arises from the esophagus. It is characterized by the presence of malignant small cells. Also known as: Oat cell carcinoma of esophagus, Oat cell carcinoma of oesophagus, Oat cell carcinoma of the esophagus, Oat cell carcinoma of the oesophagus, esophageal Oat cell carcinoma, esophageal small cell NEC, esophageal small cell carcinoma, esophagus Oat cell carcinoma.