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 . Comparison is made with the next preceding similar portable chest examinations obtained 8 and 12 hours earlier correspondingly during the same day . The previously identified temporary pacer wire has been removed . The heart size remains unchanged . The initial congestive pulmonary vascular pattern appears now normalized . A hazy density over the right lung base may be caused by pleural effusion layering in the posterior compartments , but this finding is not conclusive on this single AP chest view examination . No pneumothorax can be identified in the apical area . No new infiltrates are seen .
    OUTPUT:
    
No evidence of recent aspiration as can be ruled out by single portable AP chest view .