Figure 1.
Unsmooth surface of verified gastrointestinal mesenchymal tumors, showing the appearance of erosion or ulcer. A, B, F: Ulcerative lesions in the surface of the tumors; C, D, E: Ulcerative and depressed pits (A-D: Gastrointestinal mesenchymal tumor; E: Leiomyoma; F: Lipoma).