CTICasesAtypical Left Upper Lobe Collapse Patterns
Imaging findings
Three distinct left upper lobe collapse cases: (1) Typical collapse showing mucus plugging and anterior-medial displacement; (2) Drowned lobe syndrome secondary to bronchogenic carcinoma, where the lobe is fluid-filled and non-aerated but maintains near-normal volume; (3) Peripheral/adherent collapse where pleural adhesions keep the collapsed lung stretched along the chest wall.
Key takeaways
Left upper lobe collapse does not always follow the typical anterior-medial displacement. Drowned lobe (fluid-filled bronchogenic obstruction) and pleural adhesions can alter the radiographic appearance, mimicking a mass or effusion.
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