Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a large left - sided pleural effusion , increased in size compared to prior examination with associated compressive atelectasis . Determination of the heart size is not possible due to obscuration by this large pleural effusion . There is no large right - sided pleural effusion . There is mild central vascular pulmonary congestion with slight increased interstitial markings compatible with mild pulmonary edema . There is no pneumothorax .
    OUTPUT:
    
Large left pleural effusion , increased in size compared to prior examination with mild pulmonary edema . Although there is no definite consolidation worrisome for pneumonia , concurrent infectious process can not be excluded given the appropriate clinical circumstance . The effusion should be followed to resolution with consideration of diagnostic thoracentesis .