Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographs demonstrate an unchanged mildly enlarged cardiomediastinal silhouette . Again seen are ill - defined reticular interstitial markings , compatible with mild pulmonary edema . Opacity projecting over the lower thoracic spine on lateral view could represent a left lower lobe pneumonia . There are likely bilateral trace pleural effusions . No pneumothorax is appreciated .
    OUTPUT:
    
Retrocardiac opacity which could represent left lower lobe pneumonia . Likely bilateral trace pleural effusions . Mild pulmonary edema , increased compared to ___ .