PMC7287143_01
a) b) Chest X-ray and CT show the cystic lesion was found on the dorsal right lower lobe. c) Pigtail catheter was inserted in the cystic lesion. d) After pigtail catheter insertion, pneumothorax was detected on CT.
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Chest X-ray showed abnormal fluid retention in the right thoracic cavity (Fig. 1a). Chest CT showed a cystic lesion on the dorsal right lower lobe (segment 10) (Fig. 1b). After placement of a chest drain in the thoracic cavity, we inserted a pigtail catheter in the cystic lesion (Fig. 1c). After these treatments, the cystic lesion shrinked a little, but pneumothorax appeared (Fig. 1d).
a) A cystic lung lesion with hemorrhaging was found during the operative. b) We excised the cystic wall and removed the hematoma.
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During the operation, we found a cystic lung lesion, the wall of which was very thick, on the dorsal right lower lobe (Fig. 2a). We closed it by suturing with fascia obtained from intercostal muscle (Fig. 2b).
a) Macroscopic findings of the resected cyst. b) HE staining (left x 40, right x 100), c) AE1/AE3 staining (left x 40, right x 100), and d) TFF-1 staining (left x 100, right x 400) of the resected wall of the cyst.
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A pathological examination showed that the wall of the cyst was thickened (Fig. 3a), and it was mainly composed of visceral pleura and a normal lung parenchymal layer (Fig. 3b), which was confirmed by an immunohistochemical analysis of epithelial marker AE1/AE3 (Fig. 3c) and lung epithelial marker TTF-1 (Fig. 3d).