Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single AP upright portable view of the chest was obtained . Minimal left base atelectasis . No lobar consolidation . No pleural effusion or pneumothorax . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Mild left base opacity is likely due to atelectasis . Consider PA and lateral views when patient able . Otherwise , no acute cardiopulmonary process .