Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes that may be due to poor inspiratory effort . Suboptimal evaluation of the left lung base . There is opacification in this area but is likely due to overlying soft tissue edema . A small pleural effusion can not be completely excluded . The cardiomediastinal silhouette is within normal limits . The pulmonary vasculature is unremarkable .
    OUTPUT:
    
1 . Suboptimal evaluation of left lung base , likely due to overlying soft tissue . A small pleural effusion can not be completely excluded .