Endoscopic assessment of invasion of XXXX with a new high-frequency ultrasound probe.

@entity1 @entity189 @entity5 @entity14
The present study was carried out to clarify the usefulness of and problems associated with a new ultrasound probe in the assessment of invasion of @entity14 . Normal colorectal wall of 23 resected specimens from @entity14 cases was examined in vitro with the probe. Fifty-one @entity1 with @entity14 and 16 @entity1 with @entity5 were presurgically examined using the probe via the biopsy channel of a conventional colonoscope. After endoscopic and ultrasonographic examination, 27 @entity1 underwent endoscopic resection and 40 underwent surgical resection. The ultrasonographic findings were compared with histologic findings in all cases. @entity189 and @entity5 were visualized as an echo-poor region with the probe. The overall accuracy rate for depth of invasion was 76% (39/51) for @entity14 . The accuracy rates for @entity5 limited to the mucosa and @entity5 invading the submucosa were 83% and 90%, respectively; these rates were higher than those for @entity5 invading the muscularis propria (50%) and beyond the muscularis propria (73%). In all 16 cases of @entity5 , the depth of invasion was accurately shown to be limited to the submucosa. This probe is useful to assess invasion of @entity14 , especially small and flat lesions limited to the mucosa or submucosa.
