Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Patient is rotated . Single portable semi-erect frontal chest radiograph demonstrates hypoinflated lungs . Heterogeneous opacity within the right lower lobe is most consistent with atelectasis however differential includes pneumonia in the appropriate clinical setting . No pleural effusion or pneumothorax . Persistent mild cardiomegaly . Mediastinal contour and hila are unremarkable . Calcified tortuous aorta is again noted . Limited assessment of the upper abdomen is within normal limits .
    OUTPUT:
    
1 . Heterogeneous right lower lobe opacity is most consistent with atelectasis however differential includes pneumonia in the appropriate clinical setting . 2 . Persistent mild cardiomegaly .