Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A linear opacity in the left lung base may reflect a mild amount of scarring or tenting of the left hemidiaphragm , together with some prominent pericardial fat . Allowing for this , no confluent opacities are identified . There is no pulmonary edema or pleural effusions . Cardiomediastinal and hilar contours are within normal limits . No pneumothorax is evident .
    OUTPUT:
    
No acute cardiopulmonary process . Opacity at left base is thought to represent atelectasis / scarring and pericardial fat , best seen on ___ abdominal CT .