What is esophageal cancer?

Esophageal cancer is the growth of malignant cells usually arising from the lining of the esophagus. Esophageal cancer can be divided into two groups: squamous cell carcinoma and adenocarcinoma. Squamous cell carcinoma may occur throughout the length of the esophagus whereas adenocarcinoma normally occurs just above the esophagogastric junction.