PMC9371466_01
Chest CT scans demonstrated solitary huge lung cyst in the posterior basal segment of left lower lobe. (A) axial image, 2017; (B) axial image, 2019; (C) sagittal reformation image, 2017; (D) sagittal reformation image, 2019.
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The follow-up chest CT obtained in 2019 showed the lesion was enlarged into a measurement of approximately 86 x 61 x 37 mm, and the upper wall thickness reduced to 1.4 mm (Figure 1).
A shrunken lung cyst with mural nodule at posterior wall was detected in the original location two years later, with a strip between the cyst and pleura. (A) axial image, 2021; (B) sagittal reformation image, 2021.
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After the business trip in November 2021, another chest CT demonstrated the cyst airspace was shrunk significantly to only 13 x 12 x 6 mm with an eccentric solid mural nodule of approximately 10 x 6 x 5 mm in the posterior wall (Figure 2).
Histological section shows that the lung cyst with mural nodule after minimally invasive thoracoscopic surgery (hematoxylin-eosin staining, x40): The mural nodule was mainly composed of hyaline degenerated collagen bundles (asterisk). The collapsed lung cyst wall structure was demonstrated at the lateral side of the mural nodule (arrow).
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The postoperative pathology showed hyaline degenerated granuloma with lung cyst wall structure on the lateral side (Figure 3).