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Masato Tsunoda,Yoshimasa Miura,Hiroyuki Osawa,Tsevelnorov Khurelbaatar,Mio Sakaguchi,Hisashi Fukuda,Alan Kawarai Lefor,Hironori Yamamoto 대한소화기내시경학회 2019 Clinical Endoscopy Vol.52 No.5
A 62-year-old man with a flat early esophageal cancer was referred for endoscopic treatment. White light imaging revealed a pale redlesion, whereas linked color imaging (LCI) and blue laser imaging (BLI) yielded purple and brown images, respectively. Iodine stainingdemonstrated a large unstained area with a homogenous but very weak pink-color sign. This area appeared more clearly as purpleand green on LCI and BLI, respectively; however, a different colored portion was observed at the 4 o’clock position inside the iodineunstainedarea. Histopathology findings of the resected specimen revealed squamous intraepithelial neoplasia at the 4 o’clock positionand an esophageal squamous cell carcinoma in the remaining iodine-unstained area. LCI and BLI combined with iodine stainingproduce characteristic images that overcomes the pink-color sign, reflecting the histological features of a flat esophageal neoplasm. Thisnew method is useful for detailed evaluation of early flat squamous cell neoplasms.
Hironori Yamamoto,Satoshi Shinozaki,Yoshikazu Hayashi,Yoshimasa Miura,Tsevelnorov Khurelbaatar,Hiroyuki Osawa,Alan Kawarai Lefor 대한소화기내시경학회 2019 Clinical Endoscopy Vol.52 No.2
Early detection and resection of neoplastic lesions are key objectives to diminish colorectal cancer mortality. Resection of superficialcolorectal neoplasms, cold snare polypectomy, endoscopic mucosal resection, and endoscopic submucosal dissection have all beendeveloped and used worldwide. The pocket-creation method facilitates the resection of tumors in diffcult and routine locations. Earlydetection is the most important first step to maximize the benefits of recent advancements in endoscopic techniques. However, thedetection of small, flat-shaped, or faded color lesions remains diffcult. Linked color imaging, a novel multi-light technology, facilitatesthe recognition of minor differences in tissue by enhancing the color contrast between early colorectal neoplasms and surroundingnormal mucosa in a bright field of view. The most striking feature of linked color imaging is its ability to display the color of earlyneoplastic lesions as distinct from inflammatory changes, both of which have similar “redness” when viewed using white light imaging. To increase the detection rate of neoplasms, linked color imaging should be used from the outset for endoscopic observation. Earlydetection of superficial colorectal tumors can result in decreased mortality from colorectal cancer and maintain a good quality of life forpatients.
Linked Color Imaging and Blue Laser Imaging for Upper Gastrointestinal Screening
Hiroyuki Osawa,Yoshimasa Miura,Takahito Takezawa,Yuji Ino,Tsevelnorov Khurelbaatar,Yuichi Sagara,Alan Kawarai Lefor,Hironori Yamamoto 대한소화기내시경학회 2018 Clinical Endoscopy Vol.51 No.6
White light imaging (WLI) may not reveal early upper gastrointestinal cancers. Linked color imaging (LCI) produces bright imagesin the distant view and is performed for the same screening indications as WLI. LCI and blue laser imaging (BLI) provide excellentvisibility of gastric cancers in high color contrast with respect to the surrounding tissue. The characteristic purple and green colorof metaplasias on LCI and BLI, respectively, serve to increase the contrast while visualizing gastric cancers regardless of a history ofHelicobacter pylori eradication. LCI facilitates color-based recognition of early gastric cancers of all morphological types, including flat lesions or those in an H. pylori-negative normal background mucosa as well as the diagnosis of inflamed mucosae including erosions. LCI reveals changes inmucosal color before the appearance of morphological changes in various gastric lesions. BLI is superior to LCI in the detection ofearly esophageal cancers and abnormal findings of microstructure and microvasculature in close-up views of upper gastrointestinalcancers. Excellent images can also be obtained with transnasal endoscopy. Using a combination of these modalities allows one to obtainimages useful for establishing a diagnosis. It is important to observe esophageal cancers (brown) using BLI and gastric cancers (orange)surrounded by intestinal metaplasia (purple) and duodenal cancers (orange) by LCI.