Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Compared with ___ and allowing for differences in technique , the cardiomediastinal silhouette is unchanged . Within the limits of plain film radiography , no hilar or mediastinal enlargement and no pulmonary nodules are detected . No CHF , focal infiltrate , or effusion is identified . The minor fissure of the right lung is visible .
    OUTPUT:
    
No acute pulmonary process identified . In particular , no evidence of pneumonia is identified .