Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral chest radiographdemonstrates well expanded lungs . Lateral to the left heart border is a heterogeneous patch which is more likely to represent residual of pneumonia rather than asymmetric pulmonary edema . No evidence of active infection . No pleural effusion or pneumothorax . Mild enlargement of the cardiomediastinal silhouette noted . Mediastinal contour and hila are unremarkable .
    OUTPUT:
    
1 . Mild enlargement of cardiomediastinal silhouette . 2 . No pulmonary edema or pleural effusion 3 . Heterogeneous opacity lateral to the left heart border is more likely to represent residual of prior pneumonia than active infection .