The extent of the syrinx generally isn't as important or significant or as linked closely to pain as the width and whether the syrinx is lopsided. Presumably it is lopsided and/or wide enough at points to be causing the symptoms you see. But 'bad' MRIs are relative -- some of the worst syrinxes on MRIs actually cause the dogs very little and sometimes, no symptoms at all. If you haven;t, do read Clare Rusbridge's FAQ on SM:
http://www.veterinary-neurologist.co.uk/faq.htm
Very few neurologists shunt. Some do a combo surgery but many (like Dr Rusbridge) feel shunts cause more problems than they help as they tend to need to be redone, get infected etc. I would def get a second opinion on a surgery. Not sure who else is in your region but personally, I probably wouldn't opt for a surgery with a shunt as I am not sure there's any evidence that this helps.
I would guess Luka could be a good candidate for surgery which would likely halt progression and reduce symptoms. Personally I remain unconvinced that there's too much ultimate difference between a regular decompression and using the titanium mesh (a more invasive and complicate surgery). A lot more comparative, long term studies need to be done.
A dog under 2 showing symptoms is generally one with more severe SM that is likely to progress faster. You can definitely make the choice of managing with meds. It is very hard to predict how long Luka might go on meds vs surgery.
If I were in your shoes I would probably opt for surgery because Luka is young and fairly strongly symptomatic with a large syrinx. But I haven't opted for surgery with my own three who are mildly symptomatic, all now between 5-7 years old. For me the decision is a case by case basis, and would primarily be based on age and symptoms and likely prognosis based on MRI results and existing symptoms. Other considerations would be cost. But I can say that depending on how long a dog lives and age at diagnosis, an owner will likely pay as much or nearly so, over time for medications as for surgery.
It is a deeply personal decision and there is no right or wrong choice.
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