Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are normal . Ill - defined patchy opacities are noted in the upper lobes bilaterally . Streaky atelectasis seen in the left lung base . No pleural effusion or pneumothorax is identified . Pulmonary vasculature is normal . No acute osseous abnormality is visualized .
    OUTPUT:
    
Patchy opacities in the upper lobes bilaterally may reflect areas of infection or aspiration . Streaky atelectasis in the left lung base .