Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Frontal and lateral views of the chest demonstrate a subtle retrocardiac opacity . The lungs are otherwise clear . The cardiomediastinal and hilar contours are stable . There is no pleural effusion or pneumothorax . A left PICC ends in the upper to mid SVC .
    OUTPUT:
    
New retrocardiac opacity is concerning for an early left lower lobe pneumonia . Findings were discussed with Dr . ___ by Dr . ___ ___ the telephone on ___ at 15 : 40 , ___ min after findings were made .