Preoperative diagnosis of gastrointestinal stromal tumor by endoscopic ultrasound-guided fine needle aspiration

Figure 3 A: Submucosal lesion in the angulus of the stomach shown on endoscopy; B: EUS using ultrasound catheter probe reveals 3 cm subepithelial hypoechoic tumor with continuity to proper muscle layer (arrow-mp); C: Puncture of the small GIST under direct endosonographic visualization. The needle can be visualized; D: EUS-FNA smear of GIST showing a small tissue fragment composed of ovoid to spindle-shaped nuclei with minimal to no atypia arranged in fascicles (modified Giemsa stain).