Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mediastinal and cardiac structures unchanged . Thus , no evidence of significant cardiac enlargement . The pulmonary vasculature is not congested . Hazy density on left base most likely representing pleural effusion and atelectasis remains unchanged in comparison with the next preceding portable chest examination . Left - sided PICC line in unchanged position terminating in lower SVC . No pneumothorax has developed . ETT remains in unchanged position and is at least 4 cm above the level of the carina .
    OUTPUT:
    
Unchanged chest findings . No reoccurrence of previously encountered mediastinal shift towards the left .