Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild to moderate interstitial pulmonary edema with associated asymmetric right upper lobe opacity . A small left pleural effusion with adjacent basal atelectasis . No pneumothorax . The heart size is top - normal .
    OUTPUT:
    
Moderate interstitial edema with asymmetric right upper lobe airspace disease can be asymmetric edema in the setting of mitral valve disease , acute papillary muscle injury in the setting of myocardial infarction or edema with concurrent right upper lobe pneumonia .