Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Bronchovascular crowding in the lower lungs in the setting of low lung volumes . No convincing evidence for pneumonia , edema , effusion or pneumothorax . Heart appears mildly prominent . Mediastinal contour unremarkable . Bony structures intact . No free air below the right hemidiaphragm .
    OUTPUT:
    
Bronchovascular crowding in the lower lungs . Mild cardiomegaly .