How is esophageal cancer diagnosed?

Endoscopy and biopsy: Currently, an endoscopy (looking down your esophagus with a scope) and then a biopsy are typically used to diagnose esophageal cacner.

Endoscopy: Endoscopy is the gold standard for diagnosing esophageal cancer. This is a fiberoptic camera placed through the mouth directly into the esophagus. Suspicious lesions can be biopsied directly.

Multiple: There are multiple techniques used, some more invasive then others. The allowed number of words limits my listing all. This link may be helpful. http://www.cancer.net/cancer-types/esophageal-cancer/diagnosis.