Were you going in for scan for any concerns specifically to begin with...symptoms your dr wanted to investigate? Usually they order a CT scan or imaging when there are patient concerns and symptoms or abnormal blood tests, etc to begin with that took you to the dr.
PS gallstones can be latent, or not symptomatic, they show up on scans, but they can become serious if they pass into bile ducts of pancreas or liver causing blockages leading to infections...your dr. would be letting you know if you indeed have gallbladder disease, called cholelithiasis. If you have no symptoms of abdominal pain, and IF this is an issue (as another poster noted) then it is not serious at this point. Some people's gallstones lead to gallbladder attacks, which are painful, and frequent leading to inflammation, infection, and need to have gallbladder removed.
But this is all conjecture and speculation, which is why I asked you if there was something specific you were in for the scan for and why the dr ordered the scan.
Take care...
Tina: No way to tell or guess from the information you provided. Get in to see your doctor and find out as soon as you can. Could be something relatively simple such as gall stones... or something more serious. Best of luck...