Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: right - sided pigtail catheter is again visualized . There are small bilateral pleural effusions left greater than right . There is hazy alveolar infiltrate left greater than right which have increased compared to the prior study . There is pulmonary vascular redistribution . . There is no pneumothorax .
    OUTPUT:
    
Increased alveolar infiltrates bilaterally . This may be due to pulmonary edema but underlying infection can not be excluded