Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Streaky left base retrocardiac opacity is felt to be due to combination of vessels and atelectasis . No definite focal consolidation is seen . No pleural effusion or pneumothorax is seen . The cardiac and mediastinal silhouettes are unremarkable .
    OUTPUT:
    
Streaky left base retrocardiac opacity is felt to be due to combination of vessels and atelectasis .