Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The heart appears mild to moderately enlarged with a left ventricular configuration . The lung volumes are low . Streaky opacities at the right lung base suggests minor atelectasis . There is suspected vague new retrocardiac opacity , with low lung volumes , probably due to atelectasis .
    OUTPUT:
    
Patchy suspected retrocardiac opacity , not specific and probably compatible with atelectasis ; etiologies such as developing pneumonia or aspiration pneumonitis are not excluded , however . The opacity does not appear extensive . Evaluation with short - term follow - up radiographs could be considered .