Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate a left - sided PICC with the tip in the low SVC and a normal cardiomediastinal silhouette . A retrocardiac opacity is persistent but improved compared to ___ . There is no new focal consolidation , pleural effusion , or pneumothorax .
    OUTPUT:
    
Persistent but improved left lower lobe pneumonia . No new focal consolidation . A preliminary read was provided by Dr . ___ to Dr . ___ at ___ on ___ .