In addition, we propose the use of additional diagnostic tools other than biopsy for the detection of malignancies. In a retrospective study, 142 patients were included who had undergone surgery for suspicion of malignancy over the past 5 years at our institute. The mean diameter of the tumors was 3.5 cm (range, 1 to 10 cm). Using standard guidance for CT scanning, malignancy was proven before resection in 107 cases (75%). Peripheral lesions were observed in 73 patients. In 58 of these patients, malignancy was proven by peripheral biopsy findings, but in 15 patients only by brushing findings and not by biopsy findings. This underscores the need for additional diagnostic tools, particularly to detect tumors adjacent to the bronchi.