Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Heart size is borderline enlarged . Right middle lobe and right lower lung opacity is re - demonstrated . There is no pneumothorax . The mediastinum is not widened Aortic contour is within normal limits . There is no pleural effusion . There are degenerative changes of the left glenohumeral joint .
    OUTPUT:
    
Right midlung and lower lung opacity may represent atelectasis , however pneumonia can not be excluded in the appropriate clinical setting .