Bronchoscopically undiagnosed small peripheral lung tumors.

Small peripheral lung cancers (2 cm or less maximum diameter) are often surgically resected, and the survival rate of those patients has been reported to be significantly higher than that of patients with tumors 2.1 cm or more in diameter. We evaluated the status of these small tumors diagnosed during surgery, following unsuccessful transbronchial biopsy procedures. In a retrospective study, 84 consecutive patients, with a maximum diameter of 2 cm or less on chest computed tomography, were enrolled. All underwent surgery for diagnosis. Video-assisted thoracoscopic surgery was performed in 49 cases (58%), Video-assisted thoracoscopic surgery+mini-thoracotomy in ten cases (12%), and an open lung biopsy in 25 cases (30%). Primary lung cancer was found in 40 cases (48%), metastatic lung tumors in three cases (3%), and benign lung tumors in 41 cases (49%). Among the 40 primary lung cancer cases, adenocarcinoma was in 38, squamous cell carcinoma was in one, and small cell carcinoma was in one. The rate of stage IA was 90%. Surgical excision of undiagnosed small peripheral nodules without waiting is necessary if transbronchial biopsy diagnosis is unsuccessful, because of the high rate of stage IA non-small cell lung cancer.