Early cancers of the esophagus have no symptoms and there are no tests that can be used to screen for esophageal cancer. The presence of symptoms usually indicates that the cancer is at an advanced stage when a cure will be unlikely. Difficulty swallowing is the most common symptom, which is noticed when the diameter of the esophagus has been narrowed substantially. The treatment course and patient prognosis depends, to a great extent, on the cancer's stage.
A PET scan can show where tumor cells are growing, which helps your doctor determine the best course of treatment.