Fig. 1

The location of the lesions, access route, and feasibility of endoscopic ultrasound-guided fine-needle aspiration. A The pelvic cavity was divided into four levels—the aortoiliac bifurcation, internal–external iliac artery bifurcation, sigmoid colon, and rectum. Circle mark indicates successful puncture, although cross mark is unsuccessful puncture. Color indicates puncture sight as following: blue, the second portion of the duodenum; pink, stomach; green, sigmoid colon; yellow, rectum. B1 Axial image of the aorto-iliac bifurcation level. B2 Axial image of the internal–external iliac artery bifurcation level. B3 Axial image of the sigmoid colon level. B4 Axial image of the rectum level