PMC7995653_01
Left sided pneumothorax.
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A chest x-ray revealed a moderate-sized left pneumothorax (Fig. 1)that required tube thoracostomy placement, which resulted in the complete resolution of the pneumothorax.
CT chest: Left upper lobe cyst/Bulla with groundglass opacities.
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However, it showed mild emphysematous changes and a 3.6 x 1.9 cm cyst (Fig. 2), which was interpreted as a bulla of the left upper lobe.
CT chest: nodular thickening of the cyst wall. (white arrows).
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CT of the chest showed a mild increase in the size of the cyst to 3.9 x 2.3 cm with thickening and nodularity of the thin wall (Fig. 3).
A): The cyst wall is lined by tumor cells with nuclear atypia, keratinization and abundant mitotic figures (black arrow). The cystic lumen is labeled with a black asterisk. (H&E, X10). (B): Immunohistochemical stain shows the cells are diffusely positive for p40. ( x 10).
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Final pathology revealed poorly differentiated squamous cell carcinoma (Fig. 4A and B).