Fig. 1From: Treatment of tumor thrombus in the superior mesenteric vein due to advanced colon cancer with complete surgical resection and chemotherapy: a case reportColonoscopy image. Colonoscopy revealing a mass in the transverse colon (a). An obvious random wall was not identified. The colon was almost obstructed by the tumor, and the scope could not pass the lesion, which we considered as a type 3 tumor (b)Back to article page