Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate low lung volumes . Diffuse bilateral opacities have progressed since prior exams . There is small left pleural effusion . Hilar and mediastinal silhouettes are unchanged . Heart size is top normal . Aortic arch calcifications are noted . Right Port - A - Cath tip projects over proximal right atrium . Surgical clips and biliary stent project over right upper abdomen . Cervical fixation hardware is in place .
    OUTPUT:
    
Diffuse bilateral opacities , most likely pulmonary edema , have progressed since prior studies . However , superimposed infection can not be excluded in the appropriate clinical setting .