Submucosal Esophageal Metastasis in a Patient with Poorly Differentiated Thyroid Carcinoma:

We report an unusual case of esophageal metastasis protruding through the submucosa from a poorly differentiated thyroid carcinoma (PDTC). A PDTC is a very rare thyroid carcinoma subtype. A 68-year-old woman with PDTC exhibited recurrence at the thyroidectomy site and esophageal metastatic mass despite finishing the first treatment and undergoing regular follow-up. She received additional resective treatment with modified radical neck dissection for the recurrent neck nodes and endoscopic submucosal resection for the esophageal protruding mass. To our knowledge, no case of esophageal metastasis protruding through the submucosa from a PDTC has been previously reported.