Received a chest x-ray this morning. While viewing the x-ray, I noticed there was a large, black globe shaped object appearing under my left lung. Could that be my stomach? I know objects that are full of air, are black. Additionally Within 30 minutes prior to the x-ray I had just consumed a 16 ounce carbonated beverage. Could this cause my stomach to swell with the CO2, thereby creating the fist sized, black image on the x-ray?