Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly is persistent . Moderate left pleural effusion is largely layering , overall stable to slightly improved compared to the prior exam . There is no evidence of pneumothorax . Opacity in the right . Opacity overlying the mid left lung is only seen on the frontal view , with no correlate on the lateral view , and is likely secondary to prominence of the anterior chest wall soft tissue overlying the mid left lung . The visualized osseous structures are unremarkable .
    OUTPUT:
    
Stable to slightly improved left - sided moderate pleural effusion compared to the exam from ___ .