Brief Answer:
If only finding no reason for worry.

Detailed Answer:
I read your question carefully and I understand your concern.

If that is the only remarkable finding on your MRI exam I do not think you have much to worry. In itself that is not a lesion of the brain, does not represent any active process, it won't evolve into anything.

It simply denotes that the temporal horns, the spaces in the temporal lobes where cerebrospinal fluid is situated, are not symmetrical, one is slightly larger. The reason can't be assessed, may be a remnant from something which has happened many years before (even in the womb), like a past infection or hemorrhage, may be a normal variation, may even be a wrong impression due to the non symmetrical head position during the MRI exam. So unless there are other findings it doesn't mean much.

You do not provide any information on why did you have the MRI in the first place. The only scenario where it might mean somethin would be if it was done for seizures. In that case some special MRI cuts of the area to see the possibility of non development of the tissue in the area, serving as a potential source of seizures might be considered. Otherwise, no additional imaging exams are necessary for that finding.

I remain at your disposal for other questions.

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Brief Answer:
Not a cyst.

Detailed Answer:
No it is not a brain cyst. It is a naturally occurring space, each of us have temporal horns, your right one is simply slightly larger than the left. A cyst is a closed space filled with fluid, the temporal horn is not closed it communicates with the other ventricles where the cerebrospinal fluid circulates. So it is not a brain cyst.

As for your symptoms, it is not the cause of those, there is no relation. It is an incidental finding, by coincidence, doesn't cause any symptoms.

I hope to have been of help.

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Brief Answer:
No reason why

Detailed Answer:
Not necessarily. It is not like the dilatation found in patients with dementia which is on both sides, due to the loss of brain cells over the years.
As I said since there are no other findings indicating some other active process (like hydrocephalus) then there is nothing to make us think of an evolving issue. As I said that is something you might have always had, found by coincidence.

Let me know if I can further assist you.

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Brief Answer:
Not MS

Detailed Answer:
The fact that MRI doesn't show lesions of the brain white matter would exclude MS I would say, about 95% of the cases are detected by MRI alone. The symptoms are not that typical either, MS may present with numbness but usually there are other signs on neurological exam as well, not only sensory symptoms.

As for numbness cause, since central nervous system causes are excluded by MRI one would have to consider peripheral nerve issues. However the fact that it changes location means that it doesn't correspond to a specific nerve and makes peripheral nerve damage unlikely.

The most common cause of such widespread sensory symptoms is anxiety so that should be considered. However some possible metabolic causes should be excluded as well through some blood tests issues such as electrolyte alterations, thyroid function, vitamin B12 deficiency, anemia. So some routine tests such as CBC, ESR, CRP, electrolyte panel (including calcium and magnesium), thyroid function, vitamin B12 levels should be done as well (if not already done that is).

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Brief Answer:
Read below

Detailed Answer:
Anxiety does manifest in many different manners, symptoms like numbness, tingling, twitching etc are some of the most common manifestations, so it makes sense. As I said the above tests should be done anyway, at most an EMG as well, but if all results normal then one can safely say for anxiety to be the cause.

Wishing you good health.

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