The extent to which radical lymphadenectomy is performed for esophageal carcinoma should take into account both patient stress and cost effectiveness. We report our investigations into exactly which lymph nodes must or should be resected and which lymph nodes may be resected, but need not be resected, using our new ‘Lymph Node Compartment’ classification based on the metastases to each of the lymph nodes and based on the survival of patients with lymph node metastasis. We investigated 715 patients with thoracic esophageal carcinoma who underwent 3-field dissection from 1985 to 1989. Our Lymph Node Compartment classification indicated that for an upper thoracic esophageal carcinoma, the periesophageal and upper mediastinal nodes must be resected, while the lower mediastinal and abdominal nodes need not be resected. For a middle thoracic esophageal carcinoma, the periesophageal, upper mediastinal and abdominal nodes must be resected, and the cervical and lower mediastinal nodes ought to be resected. For a lower thoracic esophageal carcinoma, the periesophageal and abdominal nodes must be resected, while the cervical nodes need not be resected.