Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest . There is increased right perihilar opacity , compatible with known right hilar small cell lung cancer . Linear opacity in the right mid lung is likely secondary to post-obstructive atelectasis . The lungs are otherwise clear . Cardiomediastinal silhouette is otherwise unremarkable . No acute osseous abnormality .
    OUTPUT:
    
Known right perihilar mass with some right upper lobe atelectasis . No definite acute superimposed cardiopulmonary process .