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• W1967116595 abstract "Background: Recently, we reported the usefulness of magnified colonoscopic investigation of micro-vessels and showed that the presence of elongated irregular tumor vessels (L-IV) led to a diagnosis of vessel invasion caused by submucosal invasive colorectal cancer. Aim: In the present study, we investigated the relationships between the presence of L-IV, shown by magnified colonoscopic findings, and risk factors of lymph node metastasis (depth of invasion, vessel invasion, differentiation of histology, and invasive front histology) in patients with T1 colorectal carcinoma. Methods: A total of 50 T1 colorectal tumors were studied, after being resected endoscopically or during surgery. Each patient received a colonoscopic examination for colorectal cancer screening using a zoom type magnifying colonoscope EC-450ZH (Fujinon, Japan), with attention given to the microvascular findings. If a lesion was detectable by non-magnified observation, it was subsequently magnified up to 100 times using the zoom system. Immediately following the examination, the magnified findings were recorded and the colorectal tumors were divided into 2 types; type A, which had a magnified colonoscopic finding of L-IV(20 cases), and type B, which had no such finding (30 cases). Results: For type A tumors, the minimum and maximum depths of invasion were 1500 and 5000um, respectively, with a median of 2837um, while the minimum and maximum depths of type B tumors were 120 and 3500um, respectively, with a median of 1169um, which was a significant difference between the 2 groups (p<0.01). All cases with a type A tumor had vessel invasion, whereas only 3 (10%) cases with type B demonstrated vessel invasion. The rate of vessel invasion was significantly different between the 2 groups (p<0.001). In the type A group, 12 (60%) cases had a component of moderately or poorly differentiated adenocarcinoma, while only 3 cases (10%) had such finding in the type B group (p<0.01). Further, 4 (20%) tumors in the type A group and 2(7%) in the type B group showed poor differentiation in the invasion front (NS), while T1 colorectal carcinoma with lymph node metastasis was only seen in 4 cases with a type A tumor. Conclusion: The present results demonstrated that magnified colonoscopic findings of L-IV are able to predict risk factors of lymph node metastasis in cases of T1 colorectal carcinoma. Such colorectal tumors should not be removed endoscopically and must be treated surgically. Background: Recently, we reported the usefulness of magnified colonoscopic investigation of micro-vessels and showed that the presence of elongated irregular tumor vessels (L-IV) led to a diagnosis of vessel invasion caused by submucosal invasive colorectal cancer. Aim: In the present study, we investigated the relationships between the presence of L-IV, shown by magnified colonoscopic findings, and risk factors of lymph node metastasis (depth of invasion, vessel invasion, differentiation of histology, and invasive front histology) in patients with T1 colorectal carcinoma. Methods: A total of 50 T1 colorectal tumors were studied, after being resected endoscopically or during surgery. Each patient received a colonoscopic examination for colorectal cancer screening using a zoom type magnifying colonoscope EC-450ZH (Fujinon, Japan), with attention given to the microvascular findings. If a lesion was detectable by non-magnified observation, it was subsequently magnified up to 100 times using the zoom system. Immediately following the examination, the magnified findings were recorded and the colorectal tumors were divided into 2 types; type A, which had a magnified colonoscopic finding of L-IV(20 cases), and type B, which had no such finding (30 cases). Results: For type A tumors, the minimum and maximum depths of invasion were 1500 and 5000um, respectively, with a median of 2837um, while the minimum and maximum depths of type B tumors were 120 and 3500um, respectively, with a median of 1169um, which was a significant difference between the 2 groups (p<0.01). All cases with a type A tumor had vessel invasion, whereas only 3 (10%) cases with type B demonstrated vessel invasion. The rate of vessel invasion was significantly different between the 2 groups (p<0.001). In the type A group, 12 (60%) cases had a component of moderately or poorly differentiated adenocarcinoma, while only 3 cases (10%) had such finding in the type B group (p<0.01). Further, 4 (20%) tumors in the type A group and 2(7%) in the type B group showed poor differentiation in the invasion front (NS), while T1 colorectal carcinoma with lymph node metastasis was only seen in 4 cases with a type A tumor. Conclusion: The present results demonstrated that magnified colonoscopic findings of L-IV are able to predict risk factors of lymph node metastasis in cases of T1 colorectal carcinoma. Such colorectal tumors should not be removed endoscopically and must be treated surgically." @default.
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• W1967116595 date "2005-04-01" @default.
• W1967116595 modified "2023-09-26" @default.
• W1967116595 title "Magnified Colonoscopic Findings of Microvascular Architecture Useful to Predict Risk Factors of Lymph Node Metastasis in T1 Colorectal Carcinoma" @default.
• W1967116595 doi "https://doi.org/10.1016/s0016-5107(05)00661-9" @default.
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