Letter from neuro yesterday

I had a neuro appointment last month for follow up for blackouts and ? seizures. I saw the consultant this time but initially my appt was with her reg in the summer. He had not told her of my additional symptoms so when I went she was unaware of it all. My GP had arranged an MRI which the receptionist had reported to me as normal so I presumed MS was no longer a possible diagnosis. The neuro said she didn’t have time to go into these symptoms with me at this appt but she would book a double slot asap for me which is next month. On this letter I have recieved it says “I do agree she needs further evaluation whether these may represent MS or not”. How can that be the case if my brain mri was clear?