Lymph node metastasis after endoscopic submucosal dissection of a superficial esophageal adenocarcinoma arising from the ectopic gastric mucosa of the cervical esophagus: A case report

Esophageal adenocarcinoma derived from the ectopic gastric mucosa of the cervical esophagus is very rare. Little is known about the efficacy of endoscopic treatment of these superficial lesions. Herein, we report the first case of lymph node metastasis after endoscopic submucosal dissection of a lesion with invasion into the muscularis mucosa. A 46‐year‐old man underwent esophagogastroduodenoscopy during a health checkup. Endoscopy revealed a 10‐mm‐sized nodular and a 5‐mm‐sized depressed lesion within the ectopic gastric mucosa of the cervical esophagus. The biopsy specimen confirmed the presence of adenocarcinoma. The entire ectopic gastric mucosa was resected by endoscopic submucosal dissection, and pathological examination showed invasion of the muscularis mucosa. A follow‐up computed tomography scan revealed lymph node metastasis 12 months post‐treatment. The patient underwent surgical mediastinal lymphadenectomy. The patient has been regularly followed up with a computed tomography scan and endoscopy for 2 years post‐surgery with no evidence of recurrence. Close follow‐up or additional treatment after endoscopic submucosal dissection should be considered and discussed with the patient if invasion into the muscularis mucosa is observed on pathological examination.