I haven't heard of CT scans triggering cancer- but heck, seems that a lot of things are to blame for cancer these days.

I'd recommend an MRI at this stage in the game, from what I understand. I had a CT scan three days after I hit my head and they said it was normal. The MRI, six months later shows that I'm not 'normal'. So, take that for what it's worth.

By the way, in addition to this mess- I have a genetic liver disease and have had yearly CT scans on my liver since 85. So far, no cancer after 20+ CT scans! Hopefully that gives you a sense of comfort about cancer scares.