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Diagnosis of Lung Cancer
Lung cancers are often discovered during examinations for other conditions. Cancer cells may be detected in sputum; a needle biopsy may be used to remove a sample of lung tissue for analysis; or the large airways of the lungs (bronchi) can viewed directly with a bronchoscope for signs of cancer. Noninvasive methods include X rays, computed tomography (CT) scans, positron emission tomography (PET) scans, and magnetic resonance imaging (MRI).
Most cases are usually diagnosed well after the disease has spread (metastasized) from its original site. For this reason, lung cancer has a poorer prognosis than many other cancers. Even when it is detected early, the five-year survival rate is about 50 percent.
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