A 55-year-old woman experienced gastrointestinal dysfunction caused by scleroderma. An initial endoscopy revealed an erosive lesion in a long segment of Barrett's esophagus, and a biopsy led to a diagnosis of ectopic gastric mucosa. Two years later, an irregular, elevated tumor developed at the same site. This tumor was suspected of having invaded the submucosal layer. A second biopsy led to a diagnosis of adenocarcinoma. The patient subsequently underwent a thoracoscopic esophagectomy. The resected specimen revealed an invasive tumor front that had invaded the deep layer of a duplicated muscularis mucosae. Intraepithelial neoplasia partially surrounded the tumor. This lesion was thought to have developed into an adenocarcinoma according to the orderly sequence of metaplasia, intraepithelial neoplasia and finally adenocarcinoma over a 2-year period. The present case suggests that erosive lesions in Barrett's esophagus should be strictly followed up by endoscopy, even if a biopsy does not reveal any neoplastic findings.
Keywords: Duplication of the muscularis mucosae; Esophageal adenocarcinoma; Intraepithelial neoplasia; Long segmental Barrett’ esophagus; Natural history.