Endoscopic assessment of invasion of colorectal tumors with a new high-frequency ultrasound probe☆,☆☆,★,★★,♢
Section snippets
In vitro study
Twenty-three formalin-fixed resected specimens from colorectal cancer cases were examined in a water bath with the new probe and with conventional EUS (CF-UM20, Olympus Optical Co. Ltd., Tokyo, Japan) at a frequency of 7.5 MHz. To compare ultrasonographic images of normal colorectal walls with histologic findings in all cases, we inserted one needle in the middle of the submucosa and one in the muscularis propria of the specimen before scanning. After in vitro ultrasonographic examination,
In vitro study
The image of the normal colorectal wall using both the ultrasound probe and conventional EUS was seen as a seven-layered structure in vitro. The first (high-echo) layer and the second (low-echo) layers correspond to the interface echo and the mucosa, respectively. The third (high-echo) layer corresponds to the submucosa. The fourth (low-echo), fifth (high-echo), and sixth (low-echo) layers correspond to the muscularis propria; the fifth (high-echo) layer corresponds to the interface echo and
DISCUSSION
EUS has been used for nearly 10 years in the diagnosis of gastrointestinal disease.1, 2, 3, 4, 5, 6, 7, 13, 14, 15 EUS is of value clinically because it makes possible the visualization of intramural and transmural tumor growth in malignancy,16 and it has been reported to be useful for the assessment of extent of invasion of rectal tumor.17, 18, 19 Since the development of the fiberoptic echocolonoscope, the number of reports on colorectal tumors has been increasing.4, 5, 6 However,
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From the Second Department of Internal Medicine, Nagoya University School of Medicine, Tsuruma-cho, Showa-ku, Nagoya, Japan, and the Department of Internal Medicine, Toyoashi Municipal Hospital, Mastuba-cho, Toyohashi, Japan.
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Reprint requests: Masahiro Yoshida, MD, Second Department of Internal Medicine, Nagoya University School of Medicine, 65 Tsuruma-cho, Showa-ku, Nagoya 466, Japan.
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37/1/60789
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0016-5107/95/4106-0587$3.00 + 0
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GASTROINTESTINAL ENDOSCOPY