Symptomatic esophageal stricture and buried metaplasia after radiofrequency ablation of Barrett’s esophagus

 

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A 64-year-old woman with high-grade dysplasia (HGD) arising in Barrett’s esophagus was referred for treatment. Endoscopy with narrow band imaging confirmed the presence of Barrett’s esophagus (Prague C13M14) and no irregularity was detected at this level. Radiofrequency ablation (RFA) was the only treatment given, using the HALO system (BÂRRX Medical Inc., Sunnyvale, California, USA) in a standard manner, by an endoscopist highly experienced in this technique [1] [2]. After measuring the inner esophageal diameter, two consecutive circumferential ablations (12 J/cm², 40 W/cm²) were carried out using a 31-mm in-diameter balloon, with removal of tissue debris between ablations using a cap-fitted endoscope. The procedure was uneventful and esomeprazole (40 mg twice daily) was prescribed. Ten weeks later the patient (still taking esomeprazole) presented with dysphagia. An upper endoscopy disclosed a stricture and neosquamous mucosa with salmon-colored islands ([Fig. 1]). Four-quadrant biopsies (every 2 cm) from the original Barrett’s esophagus segment disclosed no residual dysplasia, but buried glands were detected in one specimen sampled above the stricture ([Fig. 2]). The stricture was dilated twice with a balloon (up to a diameter of 18 mm), and 12 months after the RFA, the patient is doing well with neither residual dysphagia nor dysplasia. However, the buried glands are more widespread (detected in biopsies at four out of seven sampled levels). No more RFA has been attempted and the patient remains under close endoscopic surveillance.

Fig. 1 Endoscopic view of a tight esophageal stricture post radiofrequency ablation (RFA); the stricture is located in the mid portion of the original Barrett’s esophagus segment (the stricture could be traversed after balloon dilation only). Note the persisting three salmon-colored islands (intestinal metaplasia at pathological examination) in the re-epithelialized squamous mucosa proximal to the stricture.

Fig. 2 Buried Barrett’s metaplasia at microscopic examination of routine biopsy sample 10 weeks post radiofrequency ablation (RFA) (hematoxylin and eosin stain, magnification × 100).

RFA has recently been proposed as a treatment for not only Barrett’s HGD and intramucosal cancer [2] but also nondysplastic Barrett’s esophagus [3]. It has been suggested that RFA does not have the drawbacks associated with other ablation techniques, in particular esophageal stricture and buried glands [2]. Our patient developed symptomatic esophageal stricture after RFA alone; this could have been because of the unusual length of Barrett’s esophagus ablation [4]. Detection of buried glands has been reported in a single case after RFA [3]. This is of concern because the true extent of Barrett’s esophagus is obscured, making endoscopic screening less reliable; moreover, adenocarcinoma has been reported to arise from buried glands after other ablative techniques [5]. In our case, sampling close to a neosquamo-columnar junction seems unlikely.

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References

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J. M. DumonceauMD, PhD 

Division of Gastroenterology and Hepatology
Geneva University Hospitals

Micheli-du-Crest street
241205 Geneva
Switzerland

Fax: +41-22-3729366

Email: jmdumonceau@hotmail.com