Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are within normal limits . Numerous cavitary nodules and masses are seen within both lungs diffusely , which appear increased in size and number compared to the prior exam . For example , a right perihilar mass now measures approximately 2 .9 cm , previously 2 .4 cm . Streaky retrocardiac opacity may reflect atelectasis , but infection is not excluded . No overt pulmonary edema is seen , and no pleural effusion or pneumothorax is present . Scarring within the lung apices is present . There are no acute osseous abnormalities .
    OUTPUT:
    
Interval increase in size and number of pulmonary metastases . Retrocardiac streaky opacity may reflect atelectasis though infection can not be excluded .