Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were reviewed . Compared to the most recent prior , left lower lobe atelectasis and mild cardiomegaly are unchanged . Otherwise the lungs are clear and the mediastinal and pleural surfaces are normal .
    OUTPUT:
    
No acute cardiopulmonary process . Mild cardiomegaly unchanged .