For those that don't know, dd (15) had spinal fusion for scoliosis in Feb.
She had a CT scan last wed to check the position of some screws because the surgeon was a bit concerned about their appearance on x-ray, and they have just rung to say that they aren't happy with one of the screws and want to take it out.
Dd burst into tears when I told her 
It's only a 40 min op, and she'll only be in 2 days if that, but she is so gutted about it as she has just got back to normal, and was gonna go back to school after easter.
Hoping it's not much of a set back.