Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single frontal view of the chest . Mild cardiomegaly is unchanged . Prominent interstitial markings predominantly involving the left lung is nonspecific and could represent chronic scarring . No focal consolidation , pleural effusion , or pneumothorax . No pneumoperitoneum is identified . Sternotomy wires and multiple mediastinal clips are unchanged . Severe left shoulder degenerative changes are similar to prior .
    OUTPUT:
    
1 . No pneumoperitoneum . 2 . Mild cardiomegaly with chronic interstitial scarring .