Hello, this is Dr yash I have gone through your question. May I know little more history to diagnose your problem. What is your age? Is that mass move up during swallowing? Do you have problem in taking both liquid as well as solid food? Do you have any gastric acid reflux disease? Since how many days you have that mass in you food pipe? At this point you can have two diagnosis, that mass can be outside from your food pipe (thyroid swelling) which can compress your food pipe or inside the food pipe( any mass). For thyroid swelling you have to go for USG soft tissue scan of your neck and TFT( thyroid function test) That mass in esophagus can only be diagnose by upper GI endoscopy and biopsy can be taken during endoscopy. If you have any other question feel free to ask. Thanks