Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest are compared to previous exam from ___ . Linear opacities in the retrocardiac region and at the bilateral bases are most suggestive of atelectasis . Superiorly , the lungs are clear . There is no pulmonary vascular congestion . The cardiomediastinal silhouette is within normal limits . The osseous structures are notable for two vertebroplasties in the mid thoracic spine . Surgical clips are identified in the left upper quadrant .
    OUTPUT:
    
Linear opacities at the lung bases suggestive of atelectasis , noting that component of infection can not be entirely excluded .