Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The left lower lobe atelectasis is substantially improved . There is still some silhouetting of left hemidiaphragm indicating that a degree of continued left basilar disease both pleural and parenchymal . The heart is not enlarged . The osseous structures are normal for age . Nasogastric tube and tracheostomy tubes are unchanged . The the lateral aspect of the left chest is not included this examination .
    OUTPUT:
    
Substantial improvement in the left chest . Density and air bronchograms , however , are still seen superimposed upon the left heart indicating residual atelectasis or consolidation in the left lower lobe .