Maier A G, Kreuzer S H, Herbst F, Wrba F, Schima W, Funovics M A, Teleky B K, Lechner G L
Department of Radiology, University of Vienna, Waehringer Guertel 18-20, A-1090 Vienna, Austria.
AJR Am J Roentgenol. 2000 Sep;175(3):735-9. doi: 10.2214/ajr.175.3.1750735.
The purpose of the study was to assess the accuracy of transrectal sonography in determining invasion by lower rectal cancer into the anal canal.
Thirty-eight patients (14 women, 24 men; mean age, 65 years) with lower rectal cancer underwent transrectal sonography before surgery. Both depth of infiltration and tumor invasion into the anal canal were assessed, and results were compared with histopathology of the resected specimens.
Infiltration into the anal canal was found histopathologically in 12 (32%) of 38 patients. Transrectal sonography revealed a true-positive diagnosis in 11 of these 12 patients. A false-positive diagnosis of anal canal infiltration was made in two patients for a sensitivity of 91%, a specificity of 85%, and an accuracy of 92%. In the 11 patients diagnosed correctly on transrectal sonography, the depth of tumor infiltration into the anal canal corresponded with histopathology.
This study shows that transrectal sonography is an accurate method for assessment of anal canal infiltration in lower rectal cancer.
本研究旨在评估经直肠超声检查在确定低位直肠癌侵犯肛管方面的准确性。
38例低位直肠癌患者（14例女性，24例男性；平均年龄65岁）在手术前行经直肠超声检查。评估浸润深度和肿瘤侵犯肛管情况，并将结果与切除标本的组织病理学结果进行比较。
38例患者中，12例（32%）经组织病理学检查发现有肛管浸润。经直肠超声检查在这12例患者中的11例做出了真阳性诊断。2例患者出现肛管浸润的假阳性诊断，敏感性为91%，特异性为85%，准确性为92%。在经直肠超声检查正确诊断的11例患者中，肿瘤浸润肛管的深度与组织病理学结果相符。
本研究表明，经直肠超声检查是评估低位直肠癌肛管浸润的一种准确方法。
