I had a fall in January and a Mild Concussion. Since my fall I have had speech stutering and sluring of words. My CT scans have been clear. My MRI shows I have Maxillary Sinutitus can that be caused from the concussion and be causing the dizziness and numbness in face?
Sinusitis is commonly diagnosed on MRI scans in ALL FOLKS and has no relation to the concussion.  Numbness of the face can have several causes.  If this numbness in the face did not begin until very recently then, there is no relationship to the concussion.  If it happened at the time of or very shortly after the brain injury then, POSSIBLY there could be a relationship if it can be shown that the brain stem itself was sufficiently jarred to cause the symptom.  The problem is there aren't any other symptoms in accompaniment that you've mentioned that would be consistent with a brain stem exaggerated force which then, should've caused other cranial nerves to malfunction, not just the one controlling sensation to the face.  In all, I would say the concussion is an unlikely causative factor for numbness of the face.  I can certainly make an argument for the stuttering problem being related to the fall as well as the dizziness component of your symptoms (again if they are time locked or synchronized to having appeared at the time of or shortly after the incident).  I think a good thorough check up by a doctor is in order. Would you do me the great favor of a STAR RATING for this answer if it at all helped you answer questions you were looking to resolve?  Be well.