Smaller nodules are more likely to be benign than larger nodules. If your doctor finds a nodule less than five millimeters (approximately one-fifth of an inch), then it is almost certainly benign. However, according to the Mayo Clinic, nodules that measure over 20 millimeters (around three-quarters of an inch) have a more than 50 percent chance of being cancerous.
Reasons for Concern
Nodules are so common that they are found in about half of all chest X-rays performed. A solitary nodule that appears on a chest X-ray may be an early sign of lung cancer, but only your doctor can determine this for sure.
Factors that influence the likelihood that a solo spot on a lung X-ray indicates cancer include:
- If you’re in your fifties or older, you have a 50 percent chance of a nodule being cancerous. In fact, people under 35 have a less than 1 percent chance of a nodule being cancerous.
- Smokers have an increased risk of lung cancer.
- Family history. Those with a family history of lung cancer are more likely to develop the disease.
- Asbestos exposure. Previous exposure to asbestos is another risk factor for lung cancer.
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