Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Since the prior examination of ___ , the lung volumes have improved . Heart is mildly enlarged . Heterogeneous linear opacities at the right base superimposed on the right hemidiaphragm probably represent residual atelectasis . There is no focal consolidation or pleural effusion . No pneumothorax .
    OUTPUT:
    
No evidence of pneumonia .