Fig. 2.

Post-contrast CT scans of the chest. (A) Preoperative coronal reconstruction using MinIP, thick-slab technique and lung windowing to demonstrate the trachea and carina in full, showing focal narrowing and rightward bowing of the mid-trachea (arrow) as well as the low position of a splayed, T-shaped carina (rectangle), without any true RUL bronchus visualised. (B) Preoperative axial post-contrast chest CT using MIP and soft-tissue windowing to demonstrate the aberrant left pulmonary artery sling (curved arrow), coursing posterior to the trachea (straight arrow). (C) Postoperative coronal reconstruction using MinIP, thick-slab technique and lung windowing to demonstrate the trachea and carina in full, showing the corrected morphology of the carina to a higher position and with a narrower angle (rectangle), as well as a normal-appearing calibre of the mid-trachea (arrow). (D) Postoperative axial post-contrast chest CT using MIP and soft-tissue windowing to demonstrate the corrected position of the left main pulmonary artery (curved arrow), anterior to the trachea (straight arrow). Bronchoscopy images. (E) Image demonstrating the top part of the tracheal stenosis, just below the subglottic area with solid tracheal rings present. (F) Image demonstrating the severe narrowing just above the carina with both anterior and posterior vascular compression visible. Bronchoscopy was performed with a 2.2 mm Olympus fibreoptic bronchoscope. (CT = computed tomography; MinIP = minimum intensity projection; RUL = right upper lobe; MIP = maximum intensity projection.)