Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in sitting upright position . Analysis is performed in direct comparison with the next preceding PA and lateral chest examination ___ ___ . The heart size has increased , but may be accentuated by the AP frontal portable chest technique . Thoracic aorta unremarkable . The pulmonary vasculature appears more congested with perivascular haze , crowded appearance on the bases . On the left base in retrocardiac position , there are some linear densities obliterating the diaphragmatic contour and that of the lower descending thoracic aorta suggestive of either right atelectasis or possible pulmonary infiltrate . There is no evidence of pneumothorax .
    OUTPUT:
    
Congested pulmonary vasculature and atelectasis on left base , pulmonary infiltrates can not be excluded . It is recommended to have a followup examination with short interval preferentially frontal and lateral view to better delineate the described basal chest findings .