PMC9975687_01
The patient's chest X-ray was taken because of the suspicion of pneumonia. The posteroanterior (PA) views of the chest radiograph show the presence of an area of parenchymal radiopacity, with the bronchovascular bundles thickening in the right suprabasal region (white arrow).
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Axial CTA scans demonstrate the characteristic sign of PAIS. A hypodense area extends along the entire left wall of the common pulmonary trunk (white arrow), resembling the wall-eclipsing sign. The polylobulated margin (asterisk) depicted on the luminal side is another differential element with CPE.
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Same CTA examination, in a scan acquired at the pulmonary veins level, demonstrates other peripheral segmental branches' involvement, with occlusion of the pulmonary arterial branches for the middle lobe (white arrow). These may be findings of SIAP advanced stages.
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Recurrence and progression of PAIS after surgical resection. Staging CECT examination shows the involvement of common pulmonary truncus with extension to the valve plane (white arrow in A), the involvement of right pulmonary artery (white arrow in B) and left pulmonary artery (white arrow in C), and also the involvement of the peripheral branches (white arrow in D).
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