Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Chest PA and lateral radiograph demonstrates unchanged prominent reticular interstitial pattern with areas of lucency consistent with history of known fibrosis . Given lung tissue abnormalities , assessment for subtle focal opacities is difficult ; however , there appears to be increased opacification obscuring the left heart border which could reflect a developing infectious process versus acute exacerbation . The aorta is tortuous . Otherwise , the mediastinal , hilar , and cardiac contours are unremarkable . No pleural effusion or pneumothorax evident . Right - sided Port - A - Cath is identified with tip in the distal superior vena cava . Degenerative changes are noted at the right acromioclavicular junction .
    OUTPUT:
    
Slightly increased focal opacity in the lingula may signify new infectious process versus acute exacerbation of known IPF .