Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: There is a subtle area of opacification silhoutteing a portion of the left hemidiaphragm with no other areas of opacification . There are no pleural effusions or pneumothorax . Previous severe cardiac enlargement from ___ is improved , now with only mild cardiomegaly remaining . Previous pulmonary vascular engorgement is now resolved .
    OUTPUT:
    
New subtle left lower lobe opacity which may reflect atelectasis or early / developing pneumonia . Findings were logged into the critical results dashboard at 3 :00 PM on ___ .