Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest were obtained . There are slightly low lung volumes as compared to the prior study . However , given this , there is increased medial right base opacity worrisome for consolidation which could be due to infection or aspiration . The left lung is grossly clear . No pleural effusion or pneumothorax is seen . Aortic knob calcification is seen . There is prominence of the main pulmonary artery , stable , which could be due to component of pulmonary hypertension .
    OUTPUT:
    
Medial right base opacification worrisome for consolidation , could be due to infection or aspiration .