Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were compared to previous exam from ___ . Linear opacity at the lung bases is most suggestive of atelectasis . There is , however , somewhat patchy but still linear opacity in the right upper lung on the frontal exam , not clearly located on the lateral . The lungs are otherwise clear . There is no effusion . Cardiomediastinal silhouette is within normal limits as are the osseous and soft tissue structures .
    OUTPUT:
    
Patchy but somewhat linear opacity in the right upper lung , this could be due to atelectasis ; however , early , developing infiltrate is also possible . Clinical correlation suggested .