Esophageal cancer is a disease in which malignant (cancer) cells form in the tissues of the esophagus.
http://www.dana-farber.org/Health-Library/Esophageal-Cancer-Treatment-(PDQ%C2%AE)-12884900950.aspx
http://www.dana-farber.org/Health-Library/Esophageal-Cancer-Treatment-(PDQ%C2%AE)-12884900950.aspx