Yorozuya T, Ikeda K, Chiba H, Saito A, Kuronuma K, Nishikiori H, Miyajima S, Takahashi M, Yoshikawa T, Takahashi Y, Taya T, Mori Y, Umeda Y, Otsuka M, Moriyama H, Takahashi H. Autoimmune Pulmonary Alveolar Proteinosis Diagnosed after Exposure to a Fire Extinguisher Containing Silica Powder.
Intern Med 2019;
58:2067-2072. [PMID:
30996157 PMCID:
PMC6702020 DOI:
10.2169/internalmedicine.1557-18]
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Abstract
We herein report a case of autoimmune pulmonary alveolar proteinosis (PAP) diagnosed after one-time exposure to silica powder. Owing to the misuse of a silica-containing fire extinguisher and the inhalation of large amounts of its powder, the patient experienced prolonged cough and visited our hospital. The findings of chest computed tomography and surgical lung biopsy specimens led to the diagnosis of PAP. Interestingly, the presence of anti-GM-CSF antibody was detected; therefore, both autoimmune characteristics and exposure to large amounts of silica may have caused the development of PAP in this patient. This case provides important insight into the mechanisms leading to the onset of PAP.
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