A case of black esophagus with duodenal involvement.

Black esophagus is a rare condition referred from acute necrosis of the esophagus, with characteristic endoscopic finings of circumferential black appearance of the mucosa. Black esophagus is associated with systemic dysfunction, such as massive bleeding, or severe dehydration. Although the duodenal mucosa is also susceptible to ischemia, reports of black esophagus with duodenal involvement, such as bleeding or perforation, are limited. Here, we present the case of a 61-year-old male who developed the typical black esophagus with duodenal involvement following severe dehydration. The patient was treated conservatively and recovered from the acute phase. In the chronic stage, transthoracic esophagectomy was performed because of esophageal stricture, and the patient then returned to his daily life. Although the etiological mechanism of acute esophageal necrosis is unknown, it is thought to be associated with the presence of an underlying severe systemic condition. Our case is not exceptional for these systemic conditions demonstrating extreme dehydration. However, it remains unclear why our case showed duodenal involvement. Although the reason is unknown, the presence of a celiac aneurysm located near the bifurcation to duodenal blood flow might explain the impaired blood flow to the duodenum.