Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size remains mildly enlarged . Aorta is tortuous and calcified . Mediastinal and hilar contours are unchanged , and the pulmonary vasculature is not engorged . Lung volumes are low which causes crowding of the bronchovascular structures . Patchy atelectasis in the left lung base is noted . No focal consolidation , pleural effusion or pneumothorax is present . There is diffuse demineralization of the osseous structures .
    OUTPUT:
    
Minor left basilar atelectasis .