Endoscopic ultrasound-guided single-incision with needle knife and deep tissue biopsy for the diagnosis of gastric subepithelial tumor

Abstract

A 80-year-old man, known to have a bleeding gastric subepthelial tumor (SET) previously treated with endoscopic hemostatic lips (Fig. 1A), was referred for further characterization. An endocopic ultrasound (EUS) revealed a 25 mm homogenous hypoechoic ell-circumscribed tumor, originating from muscular layer. An US-fine needle biopsy of the lesion resulted inconclusive (Fig. 1B). herefore a EUS-guided single-incision with needle knife (EUSINK) biopsy was performed using a linear echoendoscope guiding 10-mm linear incision over the lesion (Fig. 1C) through a