Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable AP radiograph was provided . Severe chest wall deformity and levoscoliosis with posterior fusion rod is unchanged . Patchy opacities in the lower lung fieldsare unchanged and could represent atelectasis . There is no effusion or pneumothorax . Cardiomediastinal silhouette is unchanged .
    OUTPUT:
    
No significant change from prior radiograph . Patchy opacities at the bases may reflect atelectasis , though infection can not be excluded .