Department of Radiology, Research Institute of Radiological Science, Yonsei University Health System, 250 Seongsan-no, Seodaemun-gu, Seoul, Korea.
Korean J Radiol. 2011 Jul-Aug;12(4):487-98. doi: 10.3348/kjr.2011.12.4.487. Epub 2011 Jul 22.
Rectal submucosal lesions encompass a wide variety of benign and malignant tumors involving the rectum. With optical colonoscopy, any mass-like protrusion covered by normal mucosa, whether the underlying process is intramural or extramural in origin, may be reported as a submucosal lesion. Whereas the assessment of submucosal lesions may be limited with performing optical colonoscopy, cross-sectional imaging such as CT, transrectal ultrasonography and MRI allows the evaluation of perirectal tissues and pelvic organs in addition to the entire thickness of the rectum, and so this is advantageous for the assessment of rectal submucosal tumors. Among these, MRI is the best investigative modality for soft tissue characterization. Therefore, knowledge of the MRI features of rectal submucosal tumors can help achieve accurate preoperative diagnoses and facilitate the appropriate management.
直肠黏膜下病变包括广泛的良性和恶性肿瘤，涉及直肠。通过光学结肠镜检查，任何被正常黏膜覆盖的肿块样突起，无论其潜在过程是壁内还是壁外起源，都可能被报告为黏膜下病变。虽然光学结肠镜检查对黏膜下病变的评估可能有限，但横断面成像，如 CT、经直肠超声和 MRI，除了整个直肠的厚度外，还可以评估直肠周围组织和盆腔器官，因此这有利于评估直肠黏膜下肿瘤。在这些成像方式中，MRI 是软组织特征描述的最佳检查方式。因此，了解直肠黏膜下肿瘤的 MRI 特征有助于实现准确的术前诊断，并有助于进行适当的管理。
