Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest is obtained with patient in sitting semi-upright position . Analysis is performed in direct comparison with the next preceding PA and lateral chest examination of ___ . The heart size is within normal limits . The thoracic aorta is moderately widened and elongated but no significant interval change has occurred since the next preceding chest examination of ___ . The pulmonary vasculature is not congested . No signs of acute infiltrate are present , and the lateral pleural sinuses are free . As shown already on the preceding examination , difference in translucency of the lung bases is explained by the patient 's status post left - sided mastectomy .
    OUTPUT:
    
No evidence of new pulmonary or cardiovascular abnormality as seen on portable single AP chest view examination .