Sorry to hear about this complication. I did have lymph node involvement but it was posterior (behind) the esophagus and located in the mediastinum or space between the lungs. Are you sure it is "in" the lungs and not just around the esophagus in the area of the lungs?
At my esophagectomy surgery, several lymph nodes were removed at the same time, that were found to have cancerous cells. At this point, I'm just praying that the next follow up 3 month CT scan is negative and all the sick lymph nodes were removed.
Keep us informed.