Fig. 2From: Mutations in ALK and TSC1 in a gastrointestinal stromal tumor: a case reportGastroscopy shows a large lumpy mass, approximately 26 × 40 mm2 in size, in the antrum of the stomach, with superficial ulcers scattered on the surface of the mass, a ruptured opening, and a small amount of blood. Biopsy was performed on the massBack to article page