Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Overall , there has been no significant interval change since the prior study with subtle background tissue opacity at the lung bases , relatively stable possibly minimally increased . No definite new focal consolidation is seen . There is no pleural effusion or pneumothorax . The cardiac , mediastinal , and hilar contours are stable .
    OUTPUT:
    
Mild interstitial opacities at the lung bases are stable to possibly mildly increased as compared to the prior study in this patient with known history of sarcoidosis . No definite new focal consolidation .