Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low . The heart size is top normal , possibly exaggerated by low lung volumes . No focal consolidation , pleural effusion , or pneumothorax is seen .
    OUTPUT:
    
Low lung volumes without radiographic evidence for acute process . Of note , a trace pericardial effusion was seen on CT abdomen and pelvis dated ___ and therefore mild cardiomegaly , although likely secondary to low lung volumes , small underlying pericardial effusion can not be excluded .