Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The cardiac , mediastinal and hilar contours appear unchanged . The heart is mild to moderately enlarged but unchanged . Fissures are minimally thickened . There is no pleural effusion or pneumothorax . A diffuse moderate interstitial abnormality appears very similar to the prior studies . No superimposed acute focal abnormality is identified . There has been no definite change .
    OUTPUT:
    
Similar moderate diffuse interstitial abnormality . Findings could be seen with recurring or persistent pulmonary edema , which seems mostly likely , although an underlying interstitial abnormality could also be considered .