Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . Lung volumes are somewhat low though allowing for this , there is no convincing evidence for pneumonia or edema . There is minimal basal atelectasis which is slightly improved from prior exam . Overall cardiomediastinal silhouette appears stable though the heart size is suboptimally assessed given low lung volumes . Bony structures are intact .
    OUTPUT:
    
Improved though mild persistent basilar atelectasis .