I came across this on the web today -- an interesting article on Clare Rusbridge's research on SM for a website for human sufferers of SM:

http://www.asap.org/2005/canine-syringomyelia.html

Likewise people might find this link useful, as it explains what SM is in humans and what humans feel when they have it. Interestingly symptoms most frequently show in humans between 25-40 -- so it isn;t generally something people realise they have early on.

http://healthlink.mcw.edu/article/923779378.html