Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: An endotracheal tube has been retracted somewhat , now terminating 3 cm above the carina . An orogastric tube terminates in the stomach . Aside from streaky retrocardiac opacity suggesting minor atelectasis , the lungs appear clear . There is no pleural effusion or pneumothorax .
    OUTPUT:
    
Appropriate positioning of endotracheal tube . No definite evidence of acute disease .