Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . As seen on the prior chest CT there is a mass at the left lung apex suggesting primary malignancy . Upper mediastinal contours are also prominent , although unchanged since the chest CT , reflecting prominent mediastinal fat but also lymphadenopathy worrisome for metastatic disease . Streaky left basilar opacities suggest minor atelectasis . There is no definite pleural effusion or pneumothorax .
    OUTPUT:
    
Streaky left basilar opacities , most suggestive of atelectasis . Findings similar to a recent prior CT with regard to findings suggesting primary pulmonary malignancy and mediastinal lymphadenopathy .