Laterally Spreading Tumor of the Rectum Delineated with Linked Color Imaging Technology

Masahiro Okada; Hirotsugu Sakamoto; Takahito Takezawa; Yoshikazu Hayashi; Keijiro Sunada; Alan K. Lefor; Hironori Yamamoto

doi:10.5946/ce.2015.077

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Brief Report Laterally Spreading Tumor of the Rectum Delineated with Linked Color Imaging Technology: Masahiro Okada¹, Hirotsugu Sakamoto¹, Takahito Takezawa¹, Yoshikazu Hayashi¹, Keijiro Sunada¹, Alan K. Lefor², Hironori Yamamoto^1,; Clinical Endoscopy 2016;49(2):207-208.
DOI: https://doi.org/10.5946/ce.2015.077
Published online: February 12, 2016

¹Division of Gastroenterology, Department of Medicine, Jichi Medical University, Shimotsuke, Japan

²Department of Surgery, Jichi Medical University, Shimotsuke, Japan

Correspondence: Hironori Yamamoto Division of Gastroenterology, Department of Medicine, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke 329-0498, Japan Tel: +81-285-58-7347, Fax: +81-285-40-6598, E-mail: ireef@jichi.ac.jp

• Received: May 21, 2015 • Revised: June 12, 2015 • Accepted: June 14, 2015

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Colonoscopy has been shown to decrease the incidence of colorectal cancer and cancer death through the removal of adenomatous polyps. To make an accurate diagnosis of colorectal neoplasms, several image-enhanced endoscopic systems, such as narrow band imaging (NBI), flexible spectral imaging color enhancement, and blue laser imaging (BLI), have been developed. However, no significant differences have been reported in the adenoma detection rate between image-enhanced endoscopy and conventional white light endoscopy [1]. NBI and BLI are often criticized for darkening the endoscopy image and, in turn, hampering a wider view of the colon [2]. Moreover, the miss rate for flat lesions was significantly higher than that for pedunculated lesions [3]. We present a case that suggests a possible improvement in adenoma detection rates, especially for flat adenomas.

A 66-year-old woman with a 40-mm laterally spreading tumor of the rectum was referred for endoscopic resection. Before the endoscopic resection, we observed the lesion with an EC-L590ZW endoscope with the LASEREO system (FUJIFILM Co., Tokyo, Japan), with white light (Fig. 1A) and with Linked Color Imaging (LCI) (Fig. 1B). The lesion was clearly seen as a bright reddish area on LCI. Compared with the white light image, the LCI image makes the lesion more easily recognizable, thanks to the striking color contrast between the neoplastic mucosa and the normal mucosa. The lesion was diagnosed as an adenoma on the basis of the magnified BLI images. Successful en bloc endoscopic submucosal dissection was performed for the lesion, and the diagnosis of high-grade adenoma with negative resection margins was confirmed histopathologically (Fig. 1C).

NBI is the most widely used system among several available image enhanced endoscopy systems. NBI modifies the center wavelength and bandwidth of an endoscope’s light into narrow-band illumination at 415±30 nm within the hemoglobin absorption band, thereby facilitating a clearer visualization of vascular structures [4]. However, this technique has limitations such as dark imaging of distant lesions because of narrow-band illumination. BLI was developed to compensate for these inherent limitations of NBI. BLI uses narrow-band laser light combined with white light. This combination results in a bright image of the digestive mucosa, enabling the detailed visualization of both the microstructure and the microvasculature [5]. However, BLI still is not able to obtain sufficient brightness for distant lesions. The newly developed LCI system (FUJIFILM Co.) creates clear and bright endoscopic images by using short-wavelength narrow-band laser light combined with white laser light on the basis of BLI technology. This system can obtain bright endoscopic images even at a distant view because LCI has more intense white light than the short-wavelength narrow-band laser light. Short-wavelength narrow-band laser light enhances the vessels on the mucosal surface and the patterns of the mucosa, which means that BLI enables a clearer visualization of microvascular structures than does LCI. In contrast, LCI enhances differences in hue, in the red region of the spectrum, through digital processing (Fig. 2). This makes red areas appear redder and white areas appear whiter. Thus, it is easier to recognize a slight difference in color of the mucosa. Therefore, LCI may facilitate the detection of flat colorectal neoplasms without magnification. After the detection of lesions, BLI images are easily produced with a push of a button for use in qualitative diagnosis. Further studies are needed to confirm the utility of LCI.

Conflicts of Interest: H.Y. has a consultant relationship with FUJIFILM Corporation and has received honoraria, grants, and royalties from the company.

Fig. 1.

Endoscopic images of a laterally spreading tumor (LST). (A) White light endoscopic view of an LST, 40 mm in diameter, in the rectum. (B) The lesion is easily recognizable as a bright reddish area on Linked Color Imaging. (C) Pathological image of the resected lesion (H&E stain, ×4).

Fig. 2.

Principles of Linked Color Imaging (LCI). LCI enhances differences in hue, in the red region of the spectrum, through digital processing.

REFERENCES

1. Kamiński MF, Hassan C, Bisschops R, et al. Advanced imaging for detection and differentiation of colorectal neoplasia: European Society of Gastrointestinal Endoscopy (ESGE) Guideline. Endoscopy 2014;46:435–449.Article PubMed PDF
2. Dinesen L, Chua TJ, Kaffes AJ. Meta-analysis of narrow-band imaging versus conventional colonoscopy for adenoma detection. Gastrointest Endosc 2012;75:604–611.Article PubMed
3. Heresbach D, Barrioz T, Lapalus MG, et al. Miss rate for colorectal neoplastic polyps: a prospective multicenter study of back-to-back video colonoscopies. Endoscopy 2008;40:284–290.Article PubMed
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Laterally Spreading Tumor of the Rectum Delineated with Linked Color Imaging Technology

Clin Endosc. 2016;49(2):207-208. Published online February 12, 2016

DOI: https://doi.org/10.5946/ce.2015.077

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Figure

Laterally Spreading Tumor of the Rectum Delineated with Linked Color Imaging Technology

Fig. 1. Endoscopic images of a laterally spreading tumor (LST). (A) White light endoscopic view of an LST, 40 mm in diameter, in the rectum. (B) The lesion is easily recognizable as a bright reddish area on Linked Color Imaging. (C) Pathological image of the resected lesion (H&E stain, ×4).

Fig. 2. Principles of Linked Color Imaging (LCI). LCI enhances differences in hue, in the red region of the spectrum, through digital processing.

Fig. 1.

Fig. 2.

Laterally Spreading Tumor of the Rectum Delineated with Linked Color Imaging Technology