Abstract
A 71-year-old man with lung cancer of the left upper lobe and a small thin-walled cystic lesion in the lower lobe underwent left upper lobe resection and mediastinal lymph node dissection in our hospital. One year after surgery, chest CT demonstrated that the cystic lesion had enlarged. Three years after surgery, growing ground-glass opacity was noted around this cystic lesion. Left S8 segmental resection was performed. Histological findings led to a diagnosis of bronchioloalveolar carcinoma with dilated bronchi. It was suggested that the cystic lesion was enlarged because of disruption of the cystic wall by tumor cells, check-valve obstruction of the bronchi by tumor cells and displacement of the residual left lower lobe.
