Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a persistent opacity at the left base , similar to the prior exam . This likely represents a pneumonia , and less likely reexpansion edema given that it has now persisted for two days . There is a small residual left pleural effusion , which is not significantly changed since one day ago . Overall , the volume of fluid is significantly decreased since the patient 's initial presentation . There is a new tiny left apical pneumothorax . The right lung is clear . A tiny right pleural effusion is unchanged . There is no right pneumothorax . The cardiomediastinal silhouette is normal .
    OUTPUT:
    
1 . New tiny left apical pneumothorax . 2 . Unchanged small residual left pleural effusion and left basilar opacity . 3 . Unchanged tiny right pleural effusion .