The endoscopic findings. Endoscopic findings of the primary esophageal tumor under white light (a, b), iodine staining (c), and narrow-band imaging (d). (a) An irregular ulcerative tumor in the middle to lower thoracic esophagus. (b) An elevated lesion covered with normal epithelium on the anal side of the main tumor. Biopsy scar was present on the elevated lesion. (c) Iodine staining showing surface extension of the tumor. (d) Destroyed intrapapillary capillary loops under magnified narrow-band imaging.