The value of X-ray and high-resolution computed tomography in the diagnosis of atypical foreign body in trachea and bronchus

Objective: To investigate the clinical value of chest fluoroscopy,chest radiography and high-resolution computed tomography(CT) in the diagnosis of atypical foreign body in trachea and bronchus. Methods: The data of chest fluoroscopy,chest radiography and high-resolution CT in 45 cases with atypical foreign body in trachea and bronchus diagnosed by fiberbronchoscopy were analyzed and compared. Results:The positive rate,false positive rate,false negative rate and misdiagnosis rate of chest fluoroscopy were52. 94%,17. 65%,11. 76% and 17. 65%,respectively. The positive rate,false positive rate,false negative rate and misdiagnosis rate of chest radiography were 53. 85%,15. 38%,15. 38% and 15. 38%,respectively. The positive rate of CT was 100. 00%,its false positive and negative rates were 0. 00% and 0. 00%,respectively. The difference of the positive rate in diagnosing the atypical foreign body in trachea and bronchus between chest fluoroscopy and chest radiography was not statistically significant( P 0. 05),but the diagnosic positive rate of high-resolation CT and reconstruction were higer than the fluoroscopy and radiography( P 0. 05). Conclusions:The sensibilities of chest fluoroscopy and radiography in diagnosing the atypical foreign body in trachea and bronchus are low,but CT detection is high. The CT detection is a reliable and noninvasive method for demonstrating the typical foreign body in trachea and bronchus.