I emailed you personally since my 10 year old son has VMs in almost the exact same locations as you describe.
Definitely expect some major stiffness after sclerotherapy, if that is the road you will go!! There were definite pain and head-turning issues after sclerotherapy here....we had to go and have his desk turned in class due to range of motion. About 3 weeks after sclero, the range of motion had vastly improved though!!