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Acute necrotizing esophagitis is rare. The exact etiology is unknown in most cases. The esophagus appears black, necrotic and ulcerated on the upper endoscopy, thus the term "black esophagus" is used. Histologically, there is necrosis of the esophageal mucosa and submucosa. Here, we present a patient with cholangiocarcinoma who had upper gastrointestinal bleeding and was found to have acute necrotizing esophagitis on the upper endoscopy.