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目的：提高脑ＣＴ脑内环形增强病变的鉴别诊断。方法：对１７例脑脓肿、４１例脑胶质瘤和２０例转移瘤在ＣＴ上解剖分布、数目、囊壁的形态及周围组织内的间接征像等进行比较和分析。结果：脑脓肿和转移瘤皮髓交界处分别占８２％和７９％。蛛网膜下腔内播散以脑脓肿最多见，占２４％（４／１７），胶质瘤次之（２％，１／４１），转移瘤最少见（为０）。脑脓肿壁形态特征为外厚内薄，略成口袋状（３９％，９／２３）。单发以胶质瘤为多见（９８％）。脑脓肿囊壁规则占９４％，胶质瘤仅占７％。结论：脑脓肿和转移瘤倾向于分布于皮髓交界处。囊壁规则、口袋状结构和蛛网膜下腔内播散多见于脑脓肿。
Objective: To improve the differential diagnosis of annular enhanced lesions in brain CT. Methods: The anatomic distribution, number, shape of cyst wall and indirect signs in surrounding tissue of 17 cases of brain abscess, 41 cases of glioma and 20 cases of metastatic tumor were compared and analyzed. Results: The junction of brain abscess and metastatic skin and spinal cord accounted for 82% and 79% respectively. Subarachnoid disseminated brain abscess the most common, accounting for 24% (4/17), followed by glioma (2%, 1/41), the most common metastatic tumor (0). Brain abscess wall morphology is thin outside the thickness, slightly pocket (39%, 9/23). Single glioma is more common (98%). Brain abscess wall rules accounted for 94%, gliomas only 7%. Conclusions: Brain abscesses and metastases tend to be located at the junction of the skin and spinal cord. Wall rules, pocket-like structure and subarachnoid dissemination more common in brain abscess.