Fig. 1

Acute esophageal necrosis (AEN). An emergent gastrointestinal endoscopy revealed a so-called black esophagus with color change of the mucosa throughout the entire esophagus (a). The lesion abruptly stopped at the gastroesophageal junction (b). Endoscopy on day 10 after the onset of AEN revealed that the color of the mucosa was partially improved (c, d). Esophageal stricture began approximately 1 month after AEN (e). Three months later, endoscopy revealed a pinhole stenosis of the upper thoracic esophagus (f). Two years after AEN, endoscopy revealed the esophageal obstruction with no findings of malignancy (g)