Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Single portable frontal chest radiograph demonstrates hypoinflated lungs with crowding of vasculature and right lower lobe atelectasis . No focal opacity . No pleural effusion or pneumothorax . Heart size is top - normal due to patient positioning and low lung volumes . Mediastinal contour and hila are unremarkable . Curvilinear lucency along the right hemidiaphragm is most consistent with atelectasis .
    OUTPUT:
    
Right lower lobe atelectasis . No pneumonia .