Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest provided . There is a linear opacity in the right lower lung , not well visualized on the lateral . The cardiomediastinal silhouette is normal . Imaged osseous structures are intact . No free air below the right hemidiaphragm is seen .
    OUTPUT:
    
Right lower lung linear opacity seen on the PA radiograph , could represent atelectasis , however pneumonia or aspiration are also possible .