Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Sternotomy wires are intact and aligned . Left basilar retrocardiac airspace opacity has increased . The right lung remains clear . There is no pneumothorax . Mild cardiomegaly despite the projection is unchanged .
    OUTPUT:
    
Increased left basilar airspace opacity may be due to worsening atelectasis or infection .