Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lung volumes are low , resulting in crowding of the bronchovascular structures . Patchy opacity at the left lung base , best appreciated on the lateral view , is presumably atelectasis . There is no pleural effusion or pneumothorax . Heart is mildly enlarged and unchanged . There is no evidence of pulmonary edema . The aorta is calcified and tortuous , which results in rightward bowing of the trachea . Otherwise , the mediastinal and hilar structures are unremarkable . Severe degenerative changes involve the glenohumeral joints bilaterally .
    OUTPUT:
    
Low lung volumes without an acute cardiopulmonary process .