Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Cardiomediastinal and hilar contours are stable . Opacity in the right upper lobe has substantially decreased , leaving residual nodularity which may reflect residual malignancy at the site , but opacification is markedly decreased . Elsewhere the lungs remain clear . There are no pleural effusions .
    OUTPUT:
    
Persistent nodularity in the right upper lobe , but overall marked decrease in opacification . Findings suggest improvement in malignancy and associated atelectasis ; acute process is doubtful .