Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable semi-erect frontal chest radiograph again demonstrates a left PICC terminating in the mid to upper SVC . The heart is again at least moderately enlarged . Bilateral diffuse opacities are improved compared to ___ , but again could represent mild pulmonary edema or resolving multifocal pneumonia . No new opacity is present . There is no pleural effusion or pneumothorax . The visualized upper abdomen is unremarkable .
    OUTPUT:
    
Persistent but improved bilateral diffuse opacities , which could represent mild pulmonary edema or resolving multifocal pneumonia . No new opacity .