Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is dense retrocardiac opacity on the left , and the band of opacity at the right lung base as well . Dense vascular calcifications of the aortic arch are also notable . The cardiac and mediastinal silhouette do not appear overtly enlarged , although somewhat limited by the technique . It is notable also that the lung apex is somewhat obscured by patient 's head positioning . There is no definite pleural effusion or evidence of pneumothorax .
    OUTPUT:
    
1 . Dense retrocardiac opacity is well as a band of opacity at the right lung base may represent discoid atelectasis and / or consolidative process . Distinction is difficult without comparison studies or cross - sectional studies . 2 . Notable vascular calcifications of the aortic arch .