METHODS: A 68-year-old woman were admitted in our hospital with coughing, sputum and fever. The white blood cell counts were normal (9.13*109/L) while the percentage of neutrophils elevated (82.9%), but she didn’t get remission with the antimicrobial agents. The physical examination was normal, procalcitonin was <0.1ng/mL and procalcitoninprocalcitoninprocalcitoninerythrocyte sedimentation rate was 48mm/H, C-reactive protein was 67.7mg/L. She didn’t show hypoxemia but showed a lower C3 and C4. The computer tomography presented ground glass changes in multi segments and even Crazy-Pavingsign.