There are several different tests that will allow your doctor to make a lung cancer penaksiran: if you have any symptoms of lung cancer, your doctor may order a chest x-ray. a chest x-ray of someone with lung cancer may show a visible mass or nodule. this mass will look like a white spot on your lungs, while the lung itself will appear black. however, an x-ray may not be able to detect small or early-stage cancers. a computed tomography (ct) scan is often ordered if there is something abnormal on the chest x-ray. a ct scan takes a cross-sectional and a more detailed image of the lung. it can give more information about any abnormalities, nodules, or lesions small, abnormal areas in the lungs that were seen on x-ray. a ct scan can detect smaller lesions that are not visible on a chest x-ray. cancerous lesions can often be distinguished from benign lesions on chest ct scans. your doctor cannot give you a cancer diagnosis with only an image from a ct scan or an x-ray. if they are concern