Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is atelectasis versus early infiltrate at the left lung base . Apparent opacification of the left apex is likely due to overlapping structures as there was a similar appearance on the prior radiograph performed ___ , with no subsequent apical parenchymal abnormalities seen on the subsequent CT dated ___ . Heart size remains mildly enlarged . Atherosclerotic calcifications are noted at the aortic arch . No acute osseous abnormalities identified . No subdiaphragmatic free air .
    OUTPUT:
    
1 . Atelectasis versus early infiltrate at the left base . 2 . Stable mild cardiomegaly .