Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP single view of the chest has been obtained with patient in semi-upright position . Analysis is performed in direct comparison with the next preceding similar portable chest examination ___ ___ . There is mild cardiac enlargement as before , but no evidence of pulmonary vascular congestion . There is evidence of subdiaphragmatic air on the right side , coinciding with markedly air distended colonic loops . Apparently , the patient is status post recent abdominal surgery as this finding indicates postoperative peritoneal air . On this portable single view chest examination , there is no evidence of any new acute pulmonary infiltrate and the lateral pleural sinuses are free . No evidence of pneumothorax in the apical area .
    OUTPUT:
    
No evidence of aspiration pneumonia as can be identified on single chest view examination .