Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: This exam is compromised by patient habitus and technique . There is stable small bilateral pleural effusions , but mediastinum is wider probably due to vascular engorgement . Severe cardiomegaly is chronic and stable . Moderate bilateral basal atelectasis is unchanged . Minimally improved interstitial opacities may be due to improved lung volumes and not necessarily improvement of moderate pulmonary edema . Intraaortic pump has not migrated , though 3 cm higher than conventional positioning . Otherwise , the remaining monitoring and support lines are appropriate in positioning . There is no pneumothorax .
    OUTPUT:
    
Minimal improvement in lung volume . Stable mild pulmonary edema . Progressive mediastinal widening probably due to vascular engorgement .