Computed tomography of the gastroesophageal junction.

Abstract

Computed tomography (CT) of the chest and abdomen has proved to be helpful in the preoperative staging of both esophageal and gastric carcinoma. The gastroesophageal junction however, is a difficult area to evaluate as variations in normal anatomy may mimic pathological processes. Pseudomasses at the gastroesophageal junction can be confused with neoplasm. The CT appearance of the GE junction was evaluated in 150 normal patients. CT scans were also performed on 15 patients with carcinoma involving the GE junction. Twenty cases of benign diseases of the GE junction were also studied by CT. Anatomy--The normal anatomy of the gastroesophageal junction will be illustrated with both line diagrams and CT images. The hepatogastric ligament and the caudate lobe of the liver will be demonstrated and their use in locating the GE junction will be shown. Technique--A short segment describing the appropriate technique for CT of the gastroesophageal junction will follow. The use of oral and intravenous contrast will be discussed. The need for distension of the stomach with effervescent agents and oral contrast as well as the use of decubitus and prone positioning will be emphasized when a mass-like density is seen at the GE junction. Examples will be provided. A pseudomass at the GE junction on a supine CT will be shown that disappears with distension and decubitus scanning. This will be used to lead into the next section on neoplasm in which the first example will have an identical appearance on supine CT images. Neoplasm--The relative incidence of gastric adenocarcinoma and esophageal squamous cell carcinoma at the GE junction will be briefly reviewed. The similar CT appearance of the neoplasms will be described and liberally illustrated. Metastatic involvement of lymph nodes adjacent to the GE junction will also be shown. The staging classification for CT evaluation of GE neoplasms will be reviewed. The utility of preoperative staging of esophageal and gastric neoplasms will be briefly reviewed and applied to the GE junction. Our series of patients with cancer of the GE junction will be discussed. The importance of the CT detection of criteria of inoperability will be demonstrated with examples of metastatic involvement of the liver and lymph nodes as well as direct invasion of adjacent organs. Benign Disease--Examples of benign stricture, hiatal hernia, and achalasia will be illustrated. Our cases where CT scans helped rule out a malignant process that had been suggested on barium studies will be reviewed. Summary and Conclusions--Important points of technique, normal anatomy, benign and malignant disease will be briefly reviewed.