Forward-viewing radial-array echoendoscope for staging of colon cancer beyond the rectum

Figure 1 Forward-viewing radial-array echoendoscope is a newly designed echoendoscope that provides a forward endoscopic view similar to that of a regular forward-viewing endoscope. A: Echoendoscope provides forward endoscopic view (illustrated as yellow line), ultrasound wave is distributed perpendicularly to the tip of the echoendoscope as regular radial echoendoscope (illustrated as green line); B: Figures show the model of the forward-viewing radial-array echoendoscope (radial Scan Ultrasonic Video Endoscope EG-530UR2 (FUJIFILM Corporation, Tokyo, Japan).

Figure 2 Endoscopic and endosonographic images of colon cancer obtained from the novel forward-viewing radial-array echoendoscope (radial Scan Ultrasonic Video Endoscope EG-530UR2 (FUJIFILM Corporation, Tokyo, Japan) and Ultrasound Processor SU-8000 (FUJIFILM Corporation, Tokyo, Japan). A: An endoscopic view of a colonic mass in sigmoid colon demonstrated by the echoendoscope; B: It demonstrated a hypo-echoic circumferential mass invading through muscularis propria layer (T3).