Hi, I had part of my lung removed 4 years ago. The lower right lobe with basically gone and I had a giant bleb in my lung that was removed (like a big cyst). My doctor said it was impeding my lung function. He compared it to a plant that has lots of dead leaves on it. If you don't remove the bad leaves, it takes energy away from the plant. I think it was the same for lungs. The bad part of the lung was causing a lot of infection and obstruction. He did not remove the entire lung though. I hope you get some answers from your doc. Take care, Kim