Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: AP portable upright view of the chest . In this patient with known history of pulmonary fibrosis , there is a similar appearance of the lower lung interstitial opacities as well as left mid to upper lung reticular opacities . There is no convincing sign of a superimposed pneumonia or CHF . Overall , the cardio mediastinal silhouette is stable . Right shoulder replacement noted . No acute bony injury .
    OUTPUT:
    
Stable appearance of the chest with interstitial opacities reflecting known interstitial lung disease .