
A young person writes in complaining about recurrent bouts of
Optic Neuritis (ON). She states that she is concerned about
multiple sclerosis (MS) as
ON is often the harbinger of MS.
In looking at her history and workup it is very complete. So complete, in fact, that she has been able to see a neuro-ophthalmologist and neurologist on many occasions. This workup includes MRI's of the brain and a spinal tap (lumbar puncture), the latter being, possibly, the most feared procedure that I do on a routine basis.
As an aside a lumbar puncture used to be horrible. The old kits had large needles and local anesthesia was sometimes not used.
Here is a link which explains the LP procedure and how it safely allows the treating physician to examine cerebro-spinal fluid to rule out infection, bleeding, or, in this case MS. (*It is probably incorrect to say that it 'rules out' MS as the absence of a high protein count in the fluid does not mean that one does not have the disease... merely that it is probably not
active at the present time).
MS is what's known as a 'protean' disease (after the god Proteus, who could assume many forms), for it can present with many different symptoms. The above linked articles explain the signs and symptoms of MS and
optic neuritis well so I will not bore you with them here.
When thinking about these two diseases it often helps me to think of the brain as being wired to the body with old-fashioned copper wires with plastic insulation. Imagine what would happen if yo took an old TV and cut parts of the insulation off the copper wires. Mayhem.
This is what happens with MS and with ON (though the ON patients symptoms are limited to the optic nerve and patients with MS can have neurological deficits anywhere in the body (though usually the eye, bladder, and extremities)). In the case of the human body the 'insulation' around the 'wires' is equivalent to the
myelin sheath which insulates nerves.
This particular patient is worried that her recurrent bouts of ON and mild peripheral neurologic deficits (an inability to grasp the hand correctly, or an inability to walk in a coordinated fashion) mean that she will eventually be diagnosed with MS, and this is a valid fear.
She also tells us that as a child she had
Systemic Lupus Erythematosis (Lupus), and wonders if this puts her at increased risk for a hard diagnosis of MS.
Without having time to pull articles or dust of my neurology text I seem to remember that optic neuritis usually DOES lead, eventually, to a diagnosis of MS, but not in every case. As to how a childhood diagnosis of Lupus plays in I am much less sure, but there may be an immunological link with connective tissue diseases (like Lupus) and with MS/optic neuritis, as both are posited to be based on an
auto-immune etiology (the body attacking itself).
Dear patient. You are being well cared for. Please continue to follow up with your current team of physicians and know this, if you have not had a spinal MRI when you have your symptoms, it is possible that the MS lesions might be found in the spinal cord alone and that an MRI of the brain would miss them. If you do eventually end up with the diagnosis of MS, take heart, MS is being tamed if not cured even as we speak and while for most patients it does require lifestyle changes, it almost always can be managed well with minimal consequences for the patient.