love the way you think, HH. With a little googling I've found that a connection between breast sinuses and paranasal sinuses DOES exist although there's not a whole lot of research on it. Just that Breast Cancer CAN metastasize to the paranasal sinus although it's rare. Although I guess that any cancer can metastasize to anywhere.
And, your post made me realize something about ME. After thinking that I was "done"(had only a very small area of what I thought was scar tissue near the chest wall)...I started thinking that maybe I wasn't. So, in the last week or two, I've gone back on iodine(at 150mg per day). Guess what? Same internal itching and elevated pain I've felt twice before as FBD cleared up in those areas. And same swelling of cystic area.
And, I've had sinus problems for a while...connected?