Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart is not enlarged . Within the limits of plain film radiography , no mediastinal or hilar enlargement is detected . No CHF , focal infiltrate , effusion , or pneumothorax is detected . No acute osseous abnormality is identified . Poor visualization of the sternum on the lateral view is presumably an artifact due to positioning and overlying soft tissue structures .
    OUTPUT:
    
No acute pulmonary process identified .