Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lung volumes are low . Heart size remains mild to moderately enlarged with a left ventricular predominance , unchanged . The aorta remains markedly tortuous . Mediastinal and hilar contours are otherwise similar . Crowding of bronchovascular structures is present without overt pulmonary edema . Patchy opacities in the lung bases are nonspecific , and may reflect areas of atelectasis . No pleural effusion or pneumothorax is seen . Hypertrophic changes are noted in the thoracic spine .
    OUTPUT:
    
Low lung volumes . Patchy opacities in lung bases are nonspecific and may reflect atelectasis . Infection can not be excluded in the correct clinical setting .