S2140 A Rare Case of Undifferentiated Neuroendocrine Esophageal Carcinoma With Severe Hypercalcemia. (October 2021) - Shupp, Brittney; Patel, Nishit; Cianciolo, Anthony; Liaquat, Hammad; Stoll, Lisa; Matin, Ayaz; Kaza, Chatargy