PMC6344918_01
(A) Chest CT shows lung mass in the left upper lobe. (B) Chest contrast-enhanced CT shows the mediastinal anomalous inferior lobar branch.
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Computed tomography (CT) revealed a solid mass with a 39-mm maximum diameter in the left upper lobe (Fig. 1A). Retrospectively, a thin-section CT scan revealed that the mediastinal anatomical variation was that the first trunk of the PA flowed into the lingular and basal segments (Fig. 1B).
Aberrant mediastinal trunk of the pulmonary artery (A5+A8+A9b) arose from the left main pulmonary artery and ran in front of the bronchus.
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The intraoperative view (Fig. 2) and illustrated schema (Fig. 3) show the anomalous branch as A5+A8+A9b.