Why would a ct scan not detect a lung tumor and why are they better than a X-ray?

CT scan. CT chest should not miss a lung tumor. There is no radiation involved in CT scan as as with x-rays. ... CT scan (also known as CAT scan) is similar to an MRI in the detail and quality of image it produces, yet the CT scan is actually a sophisticated, powerful x-ray that takes 360-degree pictures of internal organs, the spine, and vertebrae.

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Lung tumor CT scan with or without contrast?

Either. I usually do them without so I don't expose the patient to the contrast, which can injure kidneys. However, if the tumor is close to the mediastinum, I usually do order it with contrast because it's often difficult to tell the various structures apart without it. It also helps to identify lymph nodes. Read more...