Diagnostic Accuracy of a High-frequency Miniature Ultrasonic Probe for Evaluating the Invasion Depth of Superficial Esophageal Cancer Miwako Arima 1 , Mika Tsunomiya 1 , Takashi Fukuda 2 , Youichi Tanaka 2 , Ayataka Ishikawa 3 , Masafumi Kurozumi 3 1Department of Gastroenterology, Saitama Cancer Center, Saitama, Japan 2Department of Gastroenterological Surgery, Saitama Cancer Center, Saitama, Japan 3Department of Pathology, Saitama Cancer Center, Saitama, Japan Keyword: 超音波内視鏡 , 高周波数細径超音波プローブ , 食道表在癌 , 深達度診断 , 拡大内視鏡 pp.564-574
Published Date 2015/5/24
DOI https://doi.org/10.11477/mf.1403200283
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 We compared the diagnostic accuracy of a high-frequency miniature ultrasonic probe(mini probe)for estimating the invasion depth of superficial esophageal cancer with that of conventional observation and image enhanced magnifying endoscopy. The study group comprised 51 patients with superficial esophageal cancer in whom the tumor invasion depth was evaluated using conventional endoscopy, magnifying endoscopy, and a mini probe. All patients subsequently underwent tumor resection. In patients with EP/LPM cancer in whom conventional and magnifying endoscopy resulted in different diagnoses, the additional use of a mini probe allowed the deep invasion depth to be determined and was thus advantageous. In patients with MM/SM1 cancer, magnifying endoscopy was more sensitive than conventional endoscopy. However, many patients with SM2 cancer were erroneously included among patients who showed type B2 vessels, and the low accuracy rate remains a problem. Although the resolution of a mini probe is lower than that of magnifying endoscopy, the former is characterized by the ability to accurately detect massive submucosal invasion. The low sensitivity of magnifying endoscopy for the diagnosis of SM2 cancer is also a weak point, and a mini probe could visualize the actual tumor volume as cross-sectional images, resulting in a high diagnostic accuracy. A mini probe may be able to compensate for the weak points of magnifying endoscopy, such as low diagnostic accuracy for lesions with considerable divergence between superficial structure and tumor morphology or for submucosal tumor-like lesions. The strong points of the mini probe, conventional endoscopy, and magnifying endoscopy should be utilized at the time of diagnosis.

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