Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild enlargement of the cardiac silhouette and increase caliber pulmonary vessels is in keeping with the patient 's pregnant status . Allowing for low lung volumes which results in crowding of bronchovascular structures , there is no evidence of pulmonary edema or focal consolidation to suggest pneumonia . No definite pleural effusion .
    OUTPUT:
    
Low lung volumes . No radiographic evidence of pulmonary edema or pneumonia .