Highlights
Gastric extremely well-differentiated adenocarcinoma (EWDA) is a rare type of gastric adenocarcinoma.
It is very difficult to preoperatively diagnose gastric EWDA presenting as an elevated lesion appearing like a submucosal tumor.
This is the first report of a gastric EWDA appearing like a submucosal tumor diagnosed by preoperative endoscopic submucosal dissection.
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