Publications by authors named "Kazutomo Yamasaki"
Article Synopsis
- - The study aimed to improve early detection of ulcerative colitis-associated neoplasia (UCAN) by analyzing colonoscopy images taken before diagnosis, focusing on whether lesions were visible or invisible.
- - Out of 27 UCAN lesions reviewed, 74.1% were found to be invisible during initial examinations, with a notable prevalence in patients with rectal lesions and ongoing inflammation.
- - The findings indicate that lesions, especially in the rectum, often go unnoticed, highlighting the need for more vigilant surveillance in patients at risk for UCAN.
Background/aims: A white substance that is opaque to endoscopic light is sometimes observed in the epithelium during narrowband imaging with magnifying endoscopy of gastric or colorectal epithelial neoplasms. This prospective observational study aimed to determine whether the morphology of the white opaque substance (WOS) allows differential diagnosis between colorectal adenoma and carcinoma.
Methods: A consecutive series of patients with colorectal adenomas or early carcinomas who underwent endoscopic resection or surgical excision were studied.
Background And Study Aims: The non-extension sign relates to a localized increase in thickness and rigidity due to deep submucosal invasive (SM-d: depth of 1000 μm or more) cancer. The present study aimed to evaluate the efficacy of the non-extension sign in assessing the optical diagnosis of colorectal SM-d cancer.
Patients And Methods: We retrospectively analyzed 309 patients with 315 early colorectal cancers that had been endoscopically or surgically resected.
We previously reported our discovery of a white opaque substance (WOS) that is opaque to endoscopic light inside the epithelium while using magnifying endoscopy (ME) to examine gastric epithelial neoplasia. Histopathologic analysis revealed that the WOS comprises minute lipid droplets (LDs) accumulated within the neoplastic epithelium. In addition, the WOS was found in colorectal epithelial neoplasia, although it was unclear whether this WOS corresponded to an accumulation of LDs, as in the stomach.
View Article and Find Full Text PDFAim: This study used a multicenter questionnaire survey to evaluate the morphology and progression of the initial lesion in cases of colitis-associated colorectal neoplasia (CRN).
Patients And Methods: Endoscopic images of lesions that had been definitively diagnosed as CRN by pathological examination were retrospectively reviewed.
Results: This resulted in the identification of 54 initial lesions in 49 patients.
Background: Magnifying endoscopy (ME) with narrow-band imaging (NBI) can visualize a white opaque substance (WOS) in gastric epithelial neoplasms, gastric intestinal metaplasias, and colorectal epithelial neoplasms. Histological examination showed the WOS to be lipid droplets accumulated in the epithelium. The white appearance of colorectal hyperplastic polyps suggests that they may contain WOS, but this has not been investigated as yet.
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