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目的分析8例直肠肛管周围肌组织感染的MRI表现,初步探讨其发病机制。方法回顾性分析8例肛提肌和/或耻骨直肠肌、肛门外括约肌感染患者的MRI表现,初步分析其与肛管、直肠的关系。结果 1例发生于肛门外括约肌右半部,6例发生于肛门外括约肌深部以上水平,均伴发直肠肠壁炎性肿胀及肠壁外膜破口形成,其中5例破口位于直肠者,肛提肌、耻骨直肠肌均可见脓肿形成,伴或不伴肛门外括约肌深部病变;2例破口位于肛门外括约肌深部水平肛管者,耻骨直肠肌及肛门外括约肌深部形成感染灶,未见肛提肌受累及,即破口位置高者,直肠肛管周围肌组织感染灶位置亦较高。另外1例位于外括约肌肌浅部,感染灶与邻近中央间隙脓肿分界不清。结论局部直肠或肛管感染后炎症可播及邻近肌肉组织,肛门直肠周围肌肉组织并不能阻挡肛周感染的传播。
Objective To analyze the MRI findings of 8 cases of rectal perianal muscular tissue infection and to explore its pathogenesis. Methods The MRI findings of 8 cases of levator ani muscle and / or puborectalis muscle and external anal sphincter infection were retrospectively analyzed. Their relationship with the anal canal and rectum was analyzed preliminarily. Results 1 case occurred in the right half of the external anal sphincter, 6 cases occurred in the depth of the external anal sphincter deep, both with inflammatory bowel wall inflammation and intestinal wall rupture formation, including 5 cases of rectal in the rectum, Levator ani muscle, puborectalis were seen abscess formation, with or without external anal sphincter deep lesions; 2 cases located in the distal part of the anal external sphincter deep anal canal, puborectalis and anal external sphincter deep infection, no Levator ani involving and that the high position of the tear, rectum, anal canal around the lesion position is also higher. Another case was located in the superficial sphincter muscle, the foci of infection and the adjacent central gap abscess demarcation is not clear. Conclusions Inflammation in the rectum or anal canal infects adjacent musculature, and perianal rectal muscle does not stop the transmission of perianal infection.