What happened, in summary

A 62-year-old man with COPD and a heavy past smoking history presented twice within 2 months with a left-sided spontaneous pneumothorax. The second episode caused a persistent air leak, prompting referral for thoracic surgery. He underwent video-assisted upper-lobe wedge resection and bullectomy with talc pleurodesis. The resected tissue unexpectedly contained a 20 mm small cell lung carcinoma beneath a pleural defect. Further imaging, including brain MRI, did not show distant spread, and the cancer was described as limited-stage small cell carcinoma. After multidisciplinary review, he received 4 cycles of carboplatin plus etoposide followed by prophylactic cranial irradiation. A later chest CT showed only postsurgical changes and no evidence of tumor. He was doing well and remained under oncology follow-up. His cancer was discovered because recurrent pneumothoraces led to surgery, rather than through a typical lung-cancer symptom or screening pathway.