Figure 1. A 54-year-old woman presenting with fever: (A) Her first axial unenhanced low dose chest computed tomography (CT) showed a focal rounded ground glass opacity (GGO) in the lateral basal segment of the left lower lobe. Acute phase reactan levels were abnormal except for troponin and C-reactive protein (CRP) on the first admission. Ferritin was 120 ng/mL, Lactate dehydrogenase (LDH) was 198 U/L, erythrocyte sedimentation rate (ESR) was 22 mm/h; (B) After 3 days, her follow-up CT scan showed progression of the GGOs as well as a ferritin of 144 ng/mL, LDH of 212 U/L, ESR of 28 mm/h, and CRP of 4 mg/L. Her troponin was normal.