The value of medical imaging in uncomplicated and complicated Barrett's esophagus.

Barrett's esophagus is an acquired condition characterized by a progressive columnar metaplasia of the distal esophagus caused by longstanding gastroesophageal reflux and reflux esophagitis. Barrett's esophagus is a premalignant condition associated with a significantly increased risk of developing esophageal adenocarcinoma. The purpose of this article is to provide an overview of the radiologic aspects of Barrett's esophagus and esophageal adenocarcinoma. Review of the literature shows that some findings on esophagography that are relatively specific for Barrett's esophagus are not sensitive, while others that are sensitive have a low specificity. Specific radiologic features allowing a confident diagnosis of Barrett's esophagus are a high esophageal stricture or ulcer associated with a hiatal hernia and/or gastroesophageal reflux. A reticular mucosal pattern is a relatively specific sign particularly if located adjacent to a stricture and is highly suggestive of Barrett's esophagus. Unfortunately, these findings are only present in a minority of cases. More common but nonspecific findings include gastroesophageal reflux, hiatal hernia, reflux esophagitis and/or peptic stricture in distal esophagus. These findings may also be present in patients with uncomplicated reflux disease. Barrett's esophagus carries a risk of malignant change. Early adenocarcinoma may appear as a plaque-like lesion or with focal irregularity, nodularity, and ulceration of the esophageal wall. Invasive adenocarcinoma may be seen as an infiltrating ulcerated mass. The radiologic diagnosis of Barrett's esophagus is limited by lack of criteria that are both sensitive and specific. The major value of double-contrast esophagography is its ability to classify patients into high risk (high stricture, ulcer or reticular pattern), moderate risk (esophagitis and/or distal peptic strictures), and low-risk (absence of esophagitis or stricture) for Barrett's esophagus determining the relative need for endoscopy and biopsy. Endoscopy and biopsy are generally advocated to make a definitive diagnosis. Endoscopic ultrasound plays a role in the early detection of invasive carcinoma and the staging of proven carcinoma but has no role in the surveillance of Barrett's esophagus.