Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs : The lungs are well inflated . A density projects over the left upper lung zone as before which is stable in presumably represents soft tissues . An ill - defined 1 cm density seen in the right base which is not changed from the recent prior . This could be a summation of shadows . Further followup is recommended . Pleura : The left pleural effusion has diminished substantially since the prior examination . Density is still seen medially . Minimal residual disease remains in the bases . Heart : The heart is enlarged Mediastinum and hila : Aortic arch calcification noted . Osseous structures : The osseous structures are normal for age . Other findings : None
    OUTPUT:
    
Improvement in the left pleural effusion . Medial parenchymal or pleural density remains in the left base . Possible nodular density right base . Cardiomegaly