<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi, I m 27 years old. When I Was 12, I had a Brain surgery cause I Was diagnosed with a Brain tumor On my left side. I recently had an MRI, and it says I have abnormal signal in The Right masteroid cells. I ve been looking For information, but don t seem to understand it. Could you explain it to me. I would really appreciate it. Thank you.  <response>: Hi, I am Chat Doctor. I have read your question with care and understand your concerns. Let me try to help you Question : abnormal signal in The Right asteroid cells. Answer : This mostly indicates that there is some infection in the mastoid air cells in your temporal bone. Hope you found the answer helpful. If you need any clarification have doubts have additional questions have follow-up questions, then please do not hesitate in asking again. I will be happy to answer your questions. Let me know if I can assist you further. Take care. 