Gastric schwannoma misdiagnosed as gastrointestinal stromal tumor by ultrasonography before surgery: A case report

Figure 4 Mass was observed on the fundus of the stomach by endoscopy and endoscopic ultrasound. A: Endoscopy showed a smooth surface of the mass (orange arrow); B: Endoscopic ultrasonography showed a hypoechoic and heterogeneous mass, derived from mucous muscularis, with hyperechoic area (orange arrow); C: Endoscopic ultrasound guided fine needle aspiration. The bright line is the puncture needle (orange arrow).