Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size is mildly enlarged , similar to the previous study . Mediastinal and hilar contours are unchanged with atherosclerotic calcifications noted at the aortic knob . Pulmonary vasculature is not engorged . Streaky opacities are seen in both lung bases without focal consolidation . There may be a trace left pleural effusion . No pneumothorax is present . Sclerotic serpiginous lesion within the left proximal humeral diaphysis is unchanged , possibly an enchondroma or bone infarct .
    OUTPUT:
    
Streaky opacities in the lung bases , likely atelectasis , with possible trace left pleural effusion .