Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Comparison is made with the reference chest x-ray of ___ . The heart is not enlarged . There is increased density in the right lower zone , which appears to border on the minor fissure on the PA film and the major fissure on the lateral film . Appearances are most suggestive of volume loss and possibly big , expanding right lower lobe and middle lobe . Left pleural effusion is present , cause of which is not determined . Elsewhere , the lung fields appear clear .
    OUTPUT:
    
Volume loss in right lower lobe and probably right middle lobe .