Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Small left pleural effusion persists . No pneumothorax . The cardiac and mediastinal silhouettes are unchanged . Previously seen left fifth lateral rib fracture is again seen with underlying parenchymal abnormality probably atelectasis unchanged compared to prior study .
    OUTPUT:
    
Persistent small left pleural effusion . Unchanged parenchymal abnormality adjacent to left fifth rib fracture , likely atelectasis .