RESUMEN
Bronchioloalveolar carcinoma is originated from the periphery of the lung and can be mistaken for lobar pneumonia or atypical pneumonia clinically and at gross examination. Recently the authors experienced a 67-year-old woman who had slowly progressed pulmonary lesions for four years. At first, she visited this hospital for intermittent chest pain four years before. And she visited other hospitals for the same problem and had a series of evaluation including two times of biopsy but did not have any conclusive diagnosis. With aggravation of chest pain, she was referred to this hospital again and the lesion was reexamined and confirmed as bronchioloalveolar carcinoma by ultrasonography-guided needle biopsy. Being performed left lower lobectomy, she kept good condition without any complication.