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.

Figure 2 Histological images with hematoxylin and eosin stain. A: Panoramic view of the mass, squamous epithelium (upper orange arrow), sebaceous glands (elliptical outline), cartilage and adipose tissue (lower orange arrow), adenocarcinoma (rectangular outline); B: Squamous epithelium (× 100); C: Sebaceous glands and sweat glands (× 100); D: Cartilage and adipose tissue (× 100); E: Respiratory tract epithelium (× 100); F: Digestive gland epithelium (× 100); G: Moderately–poorly differentiated adenocarcinoma (× 100).