Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild cardiomegaly is unchanged . Prominent interstitial markings involving the left lung is nonspecific , however , could represent chronic scarring . There is mild pulmonary vascular engorgement and interstitial edema . No definite focal consolidations concerning for pneumonia are identified . There is no pleural effusion or pneumothorax . Sternotomy wires and multiple mediastinal clips are unchanged . Severe left shoulder degenerative changes are similar to the prior exam .
    OUTPUT:
    
1 . Stable mild cardiomegaly with chronic interstitial scarring . 2 . Mild interstitial pulmonary edema .