Hi yes, a syrinx can be the result of a trauma such as a MVA...they can be slow to form.
U do not need to have chiari to have a syrinx. Syringomyelia is best treated by a chiari dr and the best support will be in the chiari forum....we have members that have both chiari and syringomyelia and some that just have a syrinx.
The biggest problem with a syrinx is many times there r too small to do nething with...stents and shunts can not be used and many drs feel u should experience no ill effects....we all know that to be wrong.
Please join the chiari forum to speak with other members with a syrinx-
http://www.medhelp.org/forums/Chiari-Malformation/show/257?camp=msc
"selma"