Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . There is an opacity at the left lung base which likely reflects a moderate to large left pleural effusion and possibly adjacent compressive atelectasis , although consolidation is also possible . Heart size is difficult to evaluate given the low lung volumes . There is no pneumothorax .
    OUTPUT:
    
New moderate to large left pleural effusion with likely adjacent compressive atelectasis , although a consolidation can not be excluded in the appropriate clinical setting .