Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: No previous chest x-rays on PACS record for comparison . The heart is not enlarged . Within the limits of plain film radiography , no hilar or mediastinal lymphadenopathy is detected . No CHF , focal infiltrate or effusion is identified . Possible minimal atelectasis in the right middle lobe , with slight vascular crowding there .
    OUTPUT:
    
Possible minimal atelectasis in the right middle lobe . Otherwise , no acute pulmonary process identified .