Biopsy Protocol of Upper Gastrointestinal Subepithelial Tumors:Diagnostic Accuracy of EUS-FNB Versus Unroofing Biopsy

Unroofing biopsy menas that the mucosa is resected with endoscopic mucosal resection and biopsies are done repeatedly for the exposed tumor with a conventional forcep. It will be performed for the patients with a suspected upper gastrointestinal subepithelial tumor after EUS-FNB. After unroofing biopsy, the final histopathological result will be used to determine diagnostic accuracy.

EUS-FNB will be performed for the same patients who have a gastrointestinal subepithelail tumor before unroofing biopsy. EUS-FNB is called when the tissue is obtained by puncutre of a tumor, the tissue whithin the lumen of the fine needle being detached by rotatin, and the needle withdrawn. The pathological result will be also used to compare diagnostic accuracy between EUS-FNB \& unroofing biopsy.