Endoscopic submucosal dissection was performed to treat a 68-year-old man who was diagnosed with cervical esophageal adenocarcinoma. Pathological examination revealed a cervical esophageal adenocarcinoma Ce, left wall to posterior wall side 2/3 circumference, 35 mm, 0-IIb+I type, adenocarcinoma (pap>tub1), pT1a-LPM, INFb, Ly0, V0, pHM0, pVM0, cN0, cM0, and stage 0, which was judged as curative resection.
This tumor was considered to be an esophageal adenocarcinoma originating from the ectopic gastric mucosa, because it was contiguous with it and showed mucinous traits with gastric type predominance. With early detection, esophageal adenocarcinomas originating from the ectopic gastric mucosa may be curable by endoscopic treatment. The cervical esophagus is prone to inadequate observation, and careful observation is necessary not only during insertion, but also during endoscope removal.
