肛管、直肠周围软组织内或其周围间隙内发生急性化脓性感染，并形成脓肿，称为肛管、直肠周围脓肿。其特点是自行破溃，或在手术切开引流后常形成肛瘘。是常见的肛管直肠疾病，也是肛管、直肠炎症病理过程的急性期，肛瘘是慢性期。常见的致病菌有大肠杆菌、金黄色葡萄球菌、链球菌和绿脓杆菌，偶有厌氧性细菌和结核杆菌，常是多种病菌混合感染。骨盆直肠脓肿虽少见，但很重要。因患者自觉的局部症状不明显，而全身症状显著，故早期诊断常有延误。
盲肠脓肿 typhloempyema
小肠脓肿 enteric abscess
骨盆直肠脓肿 perirectal abscess
坐骨直肠窝脓肿 ischiorectal abscess
直肠脓肿 Rectal abscess
肛管直肠周围脓肿 perianorecrtal abscess ; perinorecrtl bscess ; perianorectal
盆腔直肠脓肿 supralevator abscess
坐骨直肠脓肿 Otitis externa in mycoses
直肠肛管周围脓肿 perianorectal abscess ; Perinorectl bscess
经历过肝脏胆管连接肠循环手术的患者具有更大的风险使得消融治疗后并发肝脓肿。
Patients who have had a surgical procedure in which the liver bile duct has been connected to a loop of bowel are at much greater risk of developing a liver abscess after ablation.
肠管增厚、肠管分层、强化增加、肠壁内脓肿、病变肠管周围蜂窝织炎、血管增多（梳征）等可反应病变的活动性。
CT findings of bowel wall thickening, mural stratification, mural hyperenhancement, mural abscess, perienteric phlegmon, and comb sign correlated with active inflammation.
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