Department of Radiology, Dalian University Xinhua Hospital, Dalian, China.
Dis Colon Rectum. 2010 Nov;53(11):1542-8. doi: 10.1007/DCR.0b013e3181f05256.
The aim of this study was to identify the normal anatomy of the anal region on magnetic resonance images.
T1-weighted turbo spin-echo images of anal sagittal sections, anal coronal sections, and oblique anal transverse planes were obtained with a body coil in 60 normal volunteers (30 women and 30 men, aged 19-25 years) at rest in the supine position.
T1-weighted images showed fat spaces and muscles simultaneously, allowing visualization of 7 image layers, including the mucosa, submucosa, anal smooth muscle, inner (intersphincteric) space, vertical levator, outer (intersphincteric) space, and external anal sphincter. The anal smooth muscle was derived from the rectal smooth muscle, and the inner space originated from the perirectal space. The outer space lay between the vertical levator and the external sphincters. The puborectalis did not have a longitudinal portion. The deep, superficial, and SC sphincters were 3 separate muscle bundles. The perianal spaces had a complex interconnection.
Multiplanar body-coil MRI studies can show anorectal fat spaces and musculature simultaneously, allowing fat spaces and musculature to serve as mutual referents. The results of imaging of the anal region with this method are different from previous imaging descriptions and may provide a more accurate and systemic description of the anal region structures than was previously available.
本研究旨在识别磁共振成像上肛门区域的正常解剖结构。
在 60 名（30 名女性和 30 名男性，年龄 19-25 岁）处于仰卧位休息状态的正常志愿者中，使用体线圈获得肛门矢状位、冠状位和斜位的 T1 加权涡轮自旋回波图像。
T1 加权图像同时显示脂肪间隙和肌肉，可显示 7 个图像层面，包括黏膜、黏膜下层、肛门平滑肌、内（肛门内括约肌）间隙、垂直提肌、外（肛门外括约肌）间隙和肛门外括约肌。肛门平滑肌源自直肠平滑肌，内间隙起源于直肠周围间隙。外间隙位于垂直提肌和外括约肌之间。耻骨直肠肌没有纵向部分。深部、浅部和 SC 括约肌是 3 个独立的肌肉束。肛周间隙具有复杂的相互连接。
多平面体线圈 MRI 研究可同时显示肛门直肠的脂肪间隙和肌肉，使脂肪间隙和肌肉可以相互参照。这种方法对肛门区域的成像结果与以前的成像描述不同，可能比以前更准确和系统地描述肛门区域的结构。
