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Carcinoembryonic Antigen Elevation in Broncholithiasis Patients Initially Misdiagnosed as Lung Cancer: a Case Report by Jing X. Liu, Qin Zhang, Jing S. Bai, Jing M. Wang, Ai S. Fu, Rong X. Liu, Xin Y. Zhou, Shan Gao, Qian C. Chen, Jia B. Zhang, Yan L. Ge

Background: We report a case of broncholithiasis with recurrent pulmonary infection accompanied by blood in the sputum, which was initially misdiagnosed as lung cancer after laboratory examination indicating elevated carcinoembryonic antigen.
Methods: Laboratory examination, enhanced chest CT scan, electronic bronchoscopy, and ultra-thin bronchoscopy were performed to diagnose broncholithiasis.
Results: Carcinoembryonic antigen levels were elevated. Chest CT scan showed dense nodules and calcification in the middle lobe of the right lung. Ultrathin bronchoscopy demonstrates calcification of the distal bronchus of the lateral middle lobe of the right lung. The symptoms were relieved after the removal of the calculi by electronic bronchoscopy.
Conclusions: It is necessary to pay attention to the calcification of the trachea and the differential diagnosis of lung cancer, especially when the level of carcinoembryonic antigen is increased.

DOI: 10.7754/Clin.Lab.2022.220225