<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, Ive been experiencing severe pain and tenderness behind my ear. I also have a fever and Im having trouble hearing. I think I have mastoiditis.  <response>: Its possible that you have mastoiditis. In order to confirm the diagnosis, we will need to perform several medical tests. First, we will do an X-ray computed tomography, also known as a Scan ct. We will also need to do an ophthalmologic and otologic diagnosis and treatment to check your eyes and ears. In addition to those, we may need to do a CAT scan of your head Head ct and Magnetic resonance imaging Mri to get a better view of your condition. 