Thank you for your query.
1. The mastoiditis
is probably secondary to an Eustachian Tube Dysfunction
2. The decreased ventilation may be causing a build-up of normal secretions in the mastoid air cells and middle ear. As the body absorbs the oxygen
, there is a relative rise in the carbon dioxide levels in the middle ear and mastoid. This further increases the secretions, setting up a viscous cycle. These trapped secretions may get infected causing pain and pressure.
3. Since bone has a poor blood supply, controlling infection in the mastoid is difficult. Is your hearing normal?
4. Get a Tympanogram (Impedance Audiogram) done to check for ETD. Upload your CT Scan
images, the ear examination findings and audiometry
tests for further advice at bit.ly/Dr-Sumit-Bhatti