The Value Of Mini-probe Endoscopic Ultrasonography In The Diagnosis Of Colorectal Eminence Lesions

Background and ObjectiveIn endoscopic examination, colorectal eminence lesion is a common imaging feature. It could be formed either by inflammation and submucosal tumor, or resulted from the extralumenal compression. The conventional endoscopy can observe the surface of the colorectal eminence lesions; however, it cannot assess the submucosal lesions, which lead to a wrong diagnosis and therapy. With the peculiar instruments, the mini-probe endoscopic ultrasonography (EUS) can observe the layers under the colorectal eminence lesions and the extraintestinal compression. EUS helps to assess the layer of origin, tumor diameter, shape, border characteristics, and internal echo patterns of submucosal tumors and thus it is possible to predict histological diagnosis. It is also worth noting that the best therapy can be chosen with the help of EUS. The aim of this article is to assess the value of mini-probe EUS in the diagnosis of colorectal eminence lesions. Materials and MethodsA total of 48 patients diagnosed with a colorectal eminence lesion were collected from June 2005 to September 2006, including 29 men and 19 women, with a meanage of 55.8 years (ranged from 28 to 80 years). A preliminary endoscopy and endoscopic biopsies were performed. The histological types of the eminence lesions have been proved by pathological examination after surgery. In order to assess the value of EUS, the examination was performed using a 15-MHz ultrathin mechanical radial scanning probe (electronic enteroscope: Fujinon EC-450WM and SP-701). Statistical analyses were performed using the Statistical Package for Social Sciences software (SSPS 11.0 for Windows). Differences with P < 0.05 were considered significant. ResultsThe EUS (the overall accuracy: 95.83%) is superior to the conventional endoscopy (68.75%) (x~2= 12.08, P < 0.05). The accuracy of EUS in the diagnosis of submucosal tumor and extraintestinal compression (100%) is significantly higher than that of the conventional endoscopy (27.27% and 25%, respectively) (x~2 =12.57 and 4.8, P < 0.05). There is no significant difference of the accuracy between the EUS and the conventional endoscopy in the diagnosis of colorectal carcinoma, colorectal polyp, and inflammatory bowel disease (x~2 = 0.615,1.03, and 0.00; P > 0.05). ConclusionsThe EUS anatomy of the colorectal wall is composed of five layers. EUS can distinguish the different layers of colorectal eminence lesions, which enables etiology diagnosis of the lesions, such as submucosal tumor and extraintestinal compression.