Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: The lungs are mildly hypoinflated . Mild vascular congestion . No pleural effusion or pneumothorax . Heart is mildly enlarged . Mediastinal contour and hila are otherwise unremarkable . A rectangular opacity is seen projecting along the left heart border .
    OUTPUT:
    
1 . Mild vascular congestion with mild cardiomegaly . No pneumonia . 2 . Rectangular metallic density projecting along the left heart border . Clinical correlation is recommended to assess whether external to patient .