Malignant transformation of primary mature teratoma of colon: A case report

Figure 1 Computed tomography, endoscopic ultrasonography, preoperative colonoscopy and gross specimen pictures. A: Computed tomography scan revealed that the sigmoid colon wall was thick (arrow); B: Endoscopic ultrasonography showed a mixed echogenic mass in the bulge of the lesion, and the structure of the intestinal wall at the base of the lesion was destroyed (arrow); C and D: Preoperative enteroscopic examination showed a mixed bulge in the intestinal mucosa and submucosa; E and F: Postoperative gross specimens showed a round bulge in the colon mucosa and submucosa, the cut surface was yellow, the muscular layer and the serosal layer of the intestinal wall were thickened and rigid.