Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a large left pleural effusion with partial collapse of the left lower lobe . Moderate atelectasis is also noted on the right and overall lung volumes are low . Heart size is likely normal , although accentuated by the portable technique and low lung volumes . There is no definite consolidation in the aerated portion of the lungs ; however , a left lower lobe consolidation could be obscured by the atelectasis and effusion . A vascular stent is seen extending across the anterior mediastinum . There is no pneumothorax .
    OUTPUT:
    
1 . Large left pleural effusion with partial collapse of the left lower lobe and patchy atelectasis at the right base in the setting of low lung volumes . Pneumonia can not be excluded .