Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral radiographs of the chest were acquired . A left tunneled dialysis catheter ends within the low SVC . Lung volumes are slightly low , with streaky left lower lobe opacities , consistent with subsegmental atelectasis . There is no focal consolidation . Mild cardiomegaly is not significantly changed compared to the radiographs from ___ , allowing for differences in lung volumes . The mediastinal contours are normal . There are no pleural effusions . No pneumothorax is seen .
    OUTPUT:
    
1 . No acute cardiac or pulmonary process . 2 . Mild cardiomegaly , not significantly changed .