Acute fibrinous and organizing pneumonia in a patient with Sjögren's syndrome and Legionella pneumonia: a case report and literature review.

The possibility of secondary AFOP should be considered when Legionella pneumonia does not improve after standard antibiotic therapy. Lung biopsy and histopathological examination are important for the adjustment of treatment strategy. Our case also highlights the importance of screening for autoimmune diseases in patients with AFOP.