Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . Somewhat linear opacity is seen at the right lung base . Retrocardiac mixed lucency and density is most suggestive of a hiatal hernia . The lungs are otherwise clear . There is no effusion . Cardiomediastinal silhouette is within normal limits . Accentuated thoracic kyphosis is noted . Osseous and soft tissue structures are otherwise unremarkable .
    OUTPUT:
    
Right basilar opacity potentially due to atelectasis however developing infection is not completely excluded .