CTICasesExogenous Lipoid Pneumonia
Imaging findings
CT chest shows a persistent region of airspace consolidation in the right lower lobe showing low attenuation (fat density measuring -30 to -80 Hounsfield units), in a patient with a history of chronic mineral oil ingestion for constipation.
Key takeaways
Exogenous lipoid pneumonia is caused by the inhalation or aspiration of lipid-containing substances, classically mineral oil. On CT, the presence of negative Hounsfield unit measurements (fat attenuation) within a region of consolidation is highly diagnostic, though it can mimic post-obstructive changes or mucinous adenocarcinoma.
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