Can An X Ray Result Showing Shadow On Lung While Suffering From Bronchitis Suggest Cancer?

lately have been down with Bronchitis. Dr did x-ray, radiologist said see's a shadow on the top of the right lung. Had a second x-ray done from a different angle and still the radiologist see's this shadow. Since several different cancets run in my family I thought it prudent to get the CT Scan. When i arrive the Technician was quite puzzled to learn this wb without contrast as she told me a contrast is all ways used for this sort of thing. After she confired with the doctor or doctors she came back and just did the Scan W/O contrast. Can i trust this result?