Is it possible to get lung cancer from a spiral ct scan?

Possible: Not from one, but from many. Cts dose you with radiation. The more you have the higher the risk of getting cancer. Most common are immune cancers such as lymphoma and leukemia.

Possible Not Likely: Medical radiation is estimated to cause about 1% of cancers. Patients trested with radiation therapy have about a 0.5% chance of having a radiation related 2nd cancer. The risk from a single spiral ct is considerably less and would likely occur 10-20 years after the exposure. Bottom line is that tests like ct scans should only be ordered for good reasons.