Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral views of the chest were reviewed and compared to the prior studies . Linear increased opacity projecting over the heart on the lateral view is most likely vascular crowding due to lower lung volumes . There is no corresponding area on the frontal view ; otherwise , the lungs are clear . Normal heart , mediastinum , and pleural surfaces .
    OUTPUT:
    
Linear opacification overlying the heart on the lateral view is likely due to vascular crowding . If there is strong clinical suspicion of pneumonia , oblique views would be helpful in making a more confident assessment .