Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart size is top - normal . The hilar and mediastinal contours are within normal limits . A wedge - like opacity at the left lung base likely represents atelectasis , as this was not present on the thoracic spine radiographs from the skeletal survey performed ___ . No focal nodule or mass is seen . There is no pneumothorax or pleural effusion .
    OUTPUT:
    
No radiographic evidence of intrathoracic malignancy .