Summarize the radiology report findings into an impression within 3 sentences.
    INPUT: Nasogastric catheter is seen coursing through the dilated esophagus , consistent with achalasia , and appears to terminate in the esophagus at the level of the posterior costophrenic sulcus . Otherwise , the exam is unchanged with unremarkable mediastinal , hilar and cardiac contours . Lungs are clear . No pleural effusion or pneumothorax is evident .
    OUTPUT:
    
Enteric catheter coursing through dilated esophagus , ending in the distal esophagus at the level of the right posterior costophrenic angle .