Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral images of the chest demonstrate well - expanded lungs . There is a persistent left - sided pleural effusion / empyema , which appears unchanged in size from most recent imaging , accounting for slightly different patient positioning . Some left basilar plate atelectasis is seen . Slight elevation of the left hemidiaphragm is also again seen . The right lung is clear with no pleural effusion . There is no pneumothorax . Cardiomediastinal silhouette is unremarkable .
    OUTPUT:
    
Essentially unchanged chest radiograph .