[en] Objective: To explore the imaging features of chest radiography and CT in patients with avian influenza A (H7N9). Methods: The imaging data of chest radiography and CT in 4 patients with H7N9 confirmed by real-time RT-PCR assay were retrospectively analyzed. All patients had chest radiography at first and 3 underwent CT examination, 3 had follow-up radiography. Results: Chest radiographs showed increased lung markings with pulmonary consolidation and interstitial change in 4 cases and consolidations were bilaterally distributed in 3 cases. The imaging appearances changed quickly during the follow-up. The bilateral consolidations, multiple ground-glass opacities, pleural effusion, hilar and mediastinal lymphadenopathy were found on CT. Conclusions: Avian influenza A (H7N9) has certain imaging features on chest radiography and CT, which is similar to those of H1N1 influenza. The final diagnosis of the avian influenza A (H7N9) depends on epidemiology and laboratory test. (authors)