Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared to most recent prior exam , there has been little interval change . Slightly increased opacity at the left lung base may represent a small pleural effusion . No right pleural effusion is detected on this frontal view . No focal consolidation or pneumothorax is detected . Increased retrocardiac density compared to ___ appears unchanged compared to ___ . Heart and mediastinal contours are stable with mild cardiomegaly and aortic tortuosity . Right - sided port appears similarly positioned with tip terminating at the cavoatrial junction . Scoliosis appear similar . Left breast prosthesis slightly limits evaluation of the lung base .
    OUTPUT:
    
Possible small left pleural effusion with otherwise unchanged exam . Discussed with Dr . ___ by Dr . ___ by phone at 2 : 13 a .m . on ___ .