Yes I did have an MRI specifically on my sinuses, but when I went back to the ENT she said she didn't think that was it and to go to an oral surgeon (dentistry). So, that is why I made the appointment for the oral surgeon. But, my dentist is so smart and he showed me on two different MRI's where my sinuses on the left side were full. And those are the teeth driving me crazy and causing this horrible taste in my mouth. I just do not know.