By
Robert L. Keith, MD, Division of Pulmonary Sciences and Critical Care Medicine, University of Colorado School of Medicine
Lung tumors may be
Primary
Metastatic from other sites in the body
Primary tumors of the lung may be
Malignant (see table )
Benign (see table )
The most common lung cancer is non–small cell lung cancer (see Lung Carcinoma Lung Carcinoma Lung carcinoma is the leading cause of cancer-related death in men and women worldwide. About 85% of cases are related to cigarette smoking. Symptoms can include cough, chest discomfort or pain... read more 
).
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