Figure 1
Pulmonary artery sling.
(a) Axial CT image reveals the LPA (arrows) anomalously originating from the posterior aspect of RPA.
(b–c) Volume‑rendered images in the anterior‑posterior (b) and posterior‑anterior (c) views illustrate a right upper lobe tracheal bronchus (asterisk) arising near the expected carina, severe distal tracheal narrowing (arrowhead), and an anomalous bridging bronchus (arrow).
Figure 2
Pulmonary artery sling.
(a) Axial CT image at the T6 level reveals an anomalous origin of the LPA (arrows) from the RPA.
(b–c) Volume‑rendered images in the anterior‑posterior (b) and posterior‑anterior (c) views reveal a pulmonary artery sling located just above the low‑lying carina with no separate right upper lobe bronchus.
C, Carina of the trachea; E, Esophagus.
Figure 3
Partial anomalous left pulmonary artery.
Axial maximum intensity projection image shows a posteriorly coursing partial anomalous left pulmonary artery (arrows) arising from the RPA. A normally originating LPA is also seen (arrowhead).
Figure 4
Idiopathic dilatation of the pulmonary trunk.
(a) Chest radiography shows bulging of the left mediastinal border (arrow).
(b–c) Axial CT (b) and volume‑rendered (c) images show marked dilatation of the pulmonary trunk and proximal pulmonary arteries.
Figure 5
Proximal interruption of the right pulmonary artery.
(a) Chest radiograph shows small right hilum.
(b) Axial CT image demonstrates abrupt termination of the RPA (arrowhead) and collateral vessels (arrows).
(c) A coronal, lung‑window CT image shows peripheral reticular opacities in the right lower lobe, corresponding to engorged subpleural collateral vessels (arrows).
(d) Tc‑99 m MAA lung perfusion scan shows complete absence of perfusion to the right lung.
Figure 6
Valvular pulmonary stenosis.
(a) Chest radiograph shows prominent left hila (arrow).
(b) Axial CT image demonstrates dilatation of the main pulmonary artery and the left pulmonary artery.
(c–d) Systolic‑phase ECG‑gated CT images show a stenotic bicuspid pulmonary valve (arrows) in en face (c) and volume‑rendered (d) views.