Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: PA and lateral chest radiographs were obtained . Moderate to severe cardiomegaly is similar . Since ___ , bilateral interstitial opacities have mildly improved . Left mid lung peripheral reticular opacities persist . The hila remain indistinct and redistribution of the upper lobe pulmonary vasculature remains . The right hemidiaphragm is still elevated . There is no new consolidation , effusion , or pneumothorax .
    OUTPUT:
    
Mild interstitial pulmonary edema has improved since ___