A 48-Year-Old Man With Multiple Pulmonary Nodular Opacities and Elevated KL-6 Level

A 48-year-old man was referred for evaluation of an abnormal chest shadow noted on a routine chest radiograph during physical examination. He was asymptomatic and had no significant medical history and occupational exposure. The patient lived in Tokyo and had no significant travel history. He had smoked approximately 20 cigarettes daily for 20 years. He had no illicit drug use and no animal-rearing history.