Clin Endosc.  2018 May;51(3):274-278. 10.5946/ce.2017.098.

Capability of Radial- and Convex-Arrayed Echoendoscopes for Visualization of the Pancreatobiliary Junction

• Kanno Y
• Ito K
• Koshita S
• Ogawa T
• Kusunose H
• Masu K
• Sakai T
• Murabayashi T
• Hasegawa S
• Kozakai F
• Kawakami Y
• Fujii Y
• Noda Y

• KMID: 2414869
• DOI: http://doi.org/10.5946/ce.2017.098

Abstract

BACKGROUND/AIMS
Although both radial- and convex-arrayed endoscopic ultrasonography (EUS) scopes are widely used for observational EUS examinations, there have been few comparative studies on their power of visualization. The aim of this study was to evaluate the capability of these EUS scopes for observation of the pancreatobiliary junction.
METHODS
The rate of successful visualization of the pancreatobiliary junction was retrospectively compared between a radial-arrayed and a convex-arrayed echoendoscope, from a prospectively maintained database. Study periods were defined as January 2010 to December 2012 for the radial group, and February 2015 to October 2016 for the convex group because the respective scope was mainly used during those periods.
RESULTS
During the study period, 1,660 cases with radial EUS and 1,984 cases with convex EUS were recruited. The success rates of observation of the pancreatobiliary junction were 80.0% and 89.5%, respectively (p < 0.0001).
CONCLUSIONS
The capability of visualization of the pancreatobiliary junction in observational EUS was found to be better with a convex-arrayed than with a radial-arrayed echoendoscope.

Keyword

Endosonography; Radial; Curved linear; Pancreatobiliary maljunction

MeSH Terms

Endosonography
Prospective Studies
Retrospective Studies

Figure

• 

  Fig. 1. “Well observed” endoscopic ultrasonography (EUS) views of the pancreatobiliary junction. “Well observed” was defined as a case in which the distal ends of both the bile duct and the main pancreatic duct were clearly observed with awareness of positional relation between these ducts, the duodenal ampulla, and the duodenal muscular layer. It does not require visualization of both the ducts in one image at the same time, especially with convex EUS. (A) View by a radial-arrayed echoendoscope. (B) View by a convex-arrayed echoendoscope.

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