Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: A portable frontal chest radiograph demonstrates a post pyloric nasoenteric tube with the tip almost to the ligament of Treitz . The cardiomediastinal silhouette is normal . There is a new retrocardiac opacity , concerning for pneumonia in the left lower lung . The right lung is clear . There is no pleural effusion or pneumothorax . No free air is seen below the diaphragm .
    OUTPUT:
    
1 . New retrocardiac opacity concerning for pneumonia in the left lower lung . 2 . Post pyloric nasal enteric tube with the tip almost to the ligament of Treitz . These findings were discussed via telephone by Dr . ___ with Dr . ___ at ___ on ___ .