My husband has the same thing. He got tubes due pain/pressure in his ear, and the CT scan showed fluid in the mastoid bone. The tubes did sort of help with the pain, and he had the tubes removed. But he continues to have air go through his ear, and experiences his voice being muffled when he talk, as well as a feeling of fullness in his ear. He was told this would clear up once the tubes were out, but it’s been 2 months with no improvement yet.