Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Upright portable view of the chest demonstrates known low lung volumes . Elevation of the right hemidiaphragm is longstanding . Right lung base opacities likely represent atelectasis . There is no pleural effusion or pneumothorax . Heart is mildly enlarged . Mild prominence of interstitial lung markings is unchnaged . Multiple surgical clips project over mediastinum . Sternotomy wires appear intact .
    OUTPUT:
    
1 . In comparison to ___ , there is no significant change in mild cardiomegaly and prominent interstitial lung markings . 2 . Right lung base atelectasis .