Computed tomography (CT)
Multidetector CT was performed with a 64-slice CT scanner (Siemens Somatom Sensation 64, Siemens, Erlangen, Germany) [11]. The intravenous contrast agent (Iomeron 300, Bracco, Milan, Italy) was administered, in all patients, with a power injector via a peripheral vein, and when possible, the examination was performed with breath holding at suspended inspiration, but in younger and noncooperative patients, quiet breathing was tolerated. CT images were interpreted without knowledge of the bronchoscopic findings.