MediAI

Lipoid Pneumonia: The Lung Mass That Mimics Cancer on CT Introduction Among the many challenges in thoracic imaging, few are more concerning than a pulmonary lesion that resembles lung cancer. A mass-like opacity discovered incidentally on chest CT often initiates a cascade of follow-up imaging, PET/CT examinations, biopsies, and patient anxiety. However, not every lung mass is malignant. One of the most fascinating examples is lipoid pneumonia , a rare condition caused by the accumulation of lipids within the pulmonary parenchyma. Although uncommon, it represents a critical diagnosis because recognition of characteristic imaging findings can prevent unnecessary invasive procedures. In the era of artificial intelligence, advanced image analysis tools increasingly assist radiologists in detecting pulmonary abnormalities. Yet even sophisticated AI algorithms may struggle when encountering rare entities such as lipoid pneumonia unless specifically trained on such cases. This case illustra...