Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Cardiac , mediastinal and hilar contours are unremarkable . Pulmonary vasculature is not engorged . Minimal patchy opacity in the left lung base likely reflects atelectasis . No focal consolidation , pleural effusion or pneumothorax is demonstrated . Multiple clips are demonstrated about the thoracic inlet with slight deviation of the trachea to the right compatible with prior thyroidectomy and residual left thyroid nodule , better demonstrated on the previous CT .
    OUTPUT:
    
Minimal left basilar patchy opacity , likely atelectasis .