Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: As compared to ___ , moderate left - sided effusion has not substantially changed . Small right - sided effusion Slight increase and adjacent opacification . Pulmonary vascular congestion has also slightly increased . Moderate cardiomegaly . No pneumothorax .
    OUTPUT:
    
Stable moderate left - sided effusion with increasing adjacent opacities may reflect worsening pneumonia and / or atelectasis .