Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are mildly hypoinflated with crowding of vasculature . Best seen on lateral view is increased opacity projecting over the posterior costophrenic angle which likely localizes to the right base on the frontal view . Left basilar linear atelectasis is noted . No pleural effusion or pneumothorax . Heart size , mediastinal contour , and hila are unremarkable .
    OUTPUT:
    
A right lower lobe opacity which could represent atelectasis though pneumonia is possible in the proper clinical setting .