Two weeks ago I had an MRI on my head and one on my shoulder at the same appointment, today I got a letter from neurology with an appointment for a lumbar puncture and MRI. I've always been sure my symptoms are caused by b12 deficiency but nobody will listen. No doctor or consultant has even hinted at what they are looking for. Nobody has discussed the results of the scans with me, just sent an appointment for the procedure which is on the 20th of December. Is this usual?