R adiographic studies (Figs 1–4) were obtained from a 60-year-old man with recurrent pneumonias for the past 15 years. He has chronic foulsmelling sputum, increasing shortness of breath, and increasing supplemental oxygen requirements. He reports a 50–pack-year history of tobacco use, but has not smoked for 12 years. In addition to bilateral crackles and rhonchi posteriorly, he exhibits digital...
