Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is new consolidation of the left retrocardiac space and streaky atelectasis at the right lung base . There is no pleural effusion or pneumothorax . Cardiac and mediastinal contours are normal . The imaged upper abdomen is unremarkable .
    OUTPUT:
    
Consolidation in the left retrocardiac space is likely atelectasis , although , pneumonia could be considered given the provided clinical history .