Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours are within normal limits . Previously noted subtle ill - defined opacity within the right lung base appears similar if not minimally worse when compared to the prior study . No focal consolidation is present , and the left lung is clear . There is no pleural effusion or pneumothorax . No acute osseous abnormality is visualized .
    OUTPUT:
    
Persistent ill - defined opacity within the right lung base which appears minimally , if at all , progressed from the prior exam , and remains concerning for infection .