Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A single portable frontal chest radiograph was obtained . Lung volumes have slightly increased since yesterday morning . Diffuse pulmonary opacities are again seen throughout both lungs . There is no effusion or pneumothorax . Mild cardiomegaly is unchanged . The tip of a right PICC line terminates in the low SVC .
    OUTPUT:
    
Persistent parenchymal opacities compatible with severe pulmonary edema . Lung volumes have slightly increased since yesterday at 09 :00 .