Abstract
Lipid pneumonia is exceedingly rare, with only a few reported cases to date. A 46-year-old woman with a history of left breast cancer underwent a left-modified radical mastectomy, adjuvant chemotherapy, and radiotherapy. Despite no known exposure to lipids, she presented with chronic non-productive cough and general malaise. Follow-up chest computed tomography revealed progressive ground-glass opacities in the left lower lung, initially suspected to be lobar bronchioloalveolar carcinoma. Surgical intervention was performed for both diagnostic and therapeutic purposes, confirming the lesion as lipid pneumonia upon pathological examination, revealing the presence of foamy histiocytes.