Abstract
A 22-year-old man was admitted with an 8-month history of left-sided chest pain as the only complaint. The patient had no family history of cancer or of exposure to echinococcosis; however, he had been smoking 10 cigarettes a day for 6 years. Chest radiograph (Figure 1A) and computed tomography (Figure 1B) showed a solitary thin-walled cavity located in the lingular segment of the left upper lobe. The lesion was 3.0cm×3.5cm; wall thickness ranged from 1mm to 1.5mm. The tentative diagnosis was bronchopulmonary cyst, but a lung bulla could not be excluded.
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