Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There are low lung volumes . Underpenetration of the lung bases due to patient body habitus makes assessment slightly suboptimal . Prominence and indistinctness of the hila and perihilar opacity suggest pulmonary edema . Linear left mid lung atelectasis / scarring is seen . Small right and possibly small left pleural effusions are seen . There is no evidence of pneumothorax . The cardiac silhouette is mild to moderately enlarged .
    OUTPUT:
    
Mild to moderate cardiomegaly , pulmonary edema , and small pleural effusions suggest CHF , underlying infection / pneumonia difficult to exclude .