Diffuse Cystic Lung Disease: Consider Sjögren Syndrome in the Differential Diagnosis

A 32-year-old woman was hospitalized in January 2019 with a 7-day history of fever, cough, and dyspnea. On examination, she was febrile, normotensive, tachycardic, and tachypneic. Her oxygen saturation was 85% on room air. Pulmonary auscultation revealed slight bibasilar crackles and diminished breath sounds at the left lung base. Thus, empirical antibiotic treatment was started. Laboratory tests showed a hemoglobin of 11.7 g/dL, a leukocyte count of 4.8 × 103/µL, and an elevated C-reactive protein (14.8 mg/L).