For those who haven't visited Dr Clare Rusbridge's website ( recently (or at all), a recent addition to the Syringomyelia section is an excellent drawing of the head of a Cavalier with CM/SM. It is very much easier for laypeople to understand than an MRI scan, and would be a very useful tool for your vet as well, if they have to explain CM/SM to the owner of a Cavalier with suspicious symptoms. If you click on the picture you can get a larger version - and also a close up of what a syrinx looks like, if you zoom in - that you can print out.

Kate, Oliver and Aled