A 75-year-old female with a long history of cigarette smoking is found to have a small tumor at the periphery of her right upper lobe. Initially, the tumor was believed to be a Stage I carcinoma (T1 NO MO), but after surgery it is found to be Stage II (T1 N1 MO). What is found at surgery that changed the staging?
Involvement of the chest wall Positive bronchial lymph nodes Small cell histology Tumor at the carina