Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Endotracheal tube well positioned . A nasoenteric tube ends in the stomach . Heart size is enlarged . There is a dense retrocardiac opacity . Right lung is grossly clear . There is calcification of the aortic knob . There is no pneumothorax . There is a small left pleural effusion .
    OUTPUT:
    
1 . Appropriate positioning of lines and tubes . 2 . Left basilar consolidative opacity , concerning for pneumonia . 3 . Moderate left pleural effusion . 4 . Grossly clear right lung .