Figure 2.

A representative case of a 73-year-old male with interstitial lung disease who was diagnosed based on endobronchial ultrasonography with a guide sheath. (A) High-resolution computed tomography showed a 15-mm solid nodule (arrow) with positive bronchus sign in his right lower lobe. Interstitial lung disease was present as the background lung. (B) The nodule was invisible on the posterior-anterior position of his chest X-ray. (C) The nodule (arrow) was visible at a 45° angle on the right side. Additionally, on fluoroscopy, the probe position was consistent with the lesion. (D) The radial endobronchial ultrasound probe was located within the lesion, and he was diagnosed with squamous cell carcinoma.