Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Lungs are well expanded . A left basilar opacity projects over the spine . There is moderate cardiomegaly , mild pulmonary edema , and a small left pleural effusion . Mediastinal contour and hila are normal . The left hemidiaphragm is elevated .
    OUTPUT:
    
1 . Lower lobe pneumonia , less likely combination of atelectasis and pulmonary edema . 2 . Small left pleural effusion . 3 . Mild pulmonary vascular congestion .