Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Portable AP upright chest radiograph was provided . Evaluation is markedly limited due to low lung volumes and under penetrated technique . There is limited evaluation , possible at the lower lungs . There is increased pulmonary opacity which could in part reflect technique , though the possibility of edema or infection is impossible to exclude . The heart and mediastinal contours appear grossly stable . No definite bony abnormalities are seen .
    OUTPUT:
    
Markedly limited exam , findings as discussed above , for which a dedicated PA and lateral view would be advised to further assess .