Hi DebraLynn and welcome to the Chiari forum.
Return of Chiari or symptoms? Chiari does not go away as it is a malformation of the skull, surgery is done to restore CSF flow and slow progression of a syrinx if one is present or prevent one from forming......
Yes, it is possible to require a 2nd surgery...the reasons differ from person to person.....it could be not enuff bone was removed or too much was removed..scar tissue may have formed causing yet another CSF obstruction..or a related condition may have been present that was unknown and the symptoms from that are triggering the Chiari symptoms to flare again....
May I ask do you know what all was done during your first surgery? did you have a laminectomy of C1 and C2? A dura plasty? if so, what type?
Lastly did you have ALL related conditions ruled out?