Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Mild prominence of the mediastinum , likely a combination of patient position as well as azygos vein engorgement . Heart size is slightly enlarged compared to prior , which considered in conjunction with mild central pulmonary vessel engorgement suggests degree of mild heart failure . The opacification in the left lung base appears to correspond with prominent cardiac fat pad and eventration of the left hemidiaphragm evident on the ___ CT , but not significantly changed compared to prior radiograph . No pleural effusion identified , though left costophrenic angle is excluded from view . No pneumothorax evident .
    OUTPUT:
    
New prominence of the cardiomediastinal silhouette and central vessels suggests mild cardiac decompensation . No pleural effusion . No focal opacification concerning for pneumonia .