Provides complete, illustrated instruction on using sputum cytology in the diagnosis of lung cancer; features a large number of previously unpublished, high-quality color photographs; describes all techniques and procedures; and includes actual examples of sputum cytology diagnoses. Because the linings of the airways leading into the lungs produce secretions that are coughed up as sputum, and because lung cancers can develop in these airways tissues, the sputum that forms near the growth will often contain cancer cells. With the proper training and reference images, physicians can now diagnose lung cancer by collecting and examining that sputum under a microscope using sputum cytology.