Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP and lateral chest radiographs demonstrate low lung volumes . Relative to prior examination dated ___ , overall appearance of the chest was not significantly changed . Heart is moderately enlarged with mild central vascular congestion . There is no focal opacity convincing for pneumonia . Right basal atelectasis is unchanged . There is no pleural effusion or pneumothorax
    OUTPUT:
    
Cardiomegaly with mild vascular congestion . No overt pulmonary edema . Low lung volumes without evidence of pneumonia .