Hi,
How are you? Fine motor skill dysfunction has many causes. This is usually related to a variety of nerve problems. Do you have co-morbidities like diabetes, thyroid disease, vitamin deficiency? Aside from MRI or nerve studies, what other tests were done? A referral to a specialist or neurologist is needed to help determine the underlying cause.Your medical history and physical and neurological examination are important. Take care and do keep us posted.
Did they do the MRI with dye? I have MS and when they did an mri without dye it didn't quite show up took dye to get it to light it up and reveal itself. Lesions are like that. If it is not that could be in your neck have you had them check your neck? I am not a doctor but a patient who has experierenced your problem before and these are things they checked on me. Hand, wrist, shoulder, neck, spne, brain, spnal fluid when it continued to spread to the other arm as well then later the rest of my body with numbness as well. Do you or have you ever had any numbness?