目的　探讨特殊类型嗜铬细胞瘤的CT特征。方法　收集手术及病理证实的特殊类型嗜铬细胞瘤 18例 ,其中异位 2例 ,双侧或多发 3例 ,无功能 7例 ,恶性或恶变 11例 (包括以上肿瘤中的恶性嗜铬细胞瘤 5例 )。结果　所有肿瘤CT平扫均为等密度实性肿块 ,其内有大小不等中心性或不规则液化、坏死 ,甚至囊变。偶呈较低密度 ,并有钙化。增强后实性部分强化明显。结论　 (1)特殊类型嗜铬细胞瘤恶性率高。 (2 )CT定位、定性准确率高 ,但除非有明确浸润及转移征象 ,尚无法区分良恶性。肿瘤的大小对良恶性的区别仅可作为参考指标。无功能者诊断较难 ,须结合实验室及其他检查明确 Objective To explore the CT features of specific types of pheochromocytoma. Methods Eighteen cases of pheochromocytoma confirmed by operation and pathology were collected. Among them, 2 cases were ectopic, 3 cases were bilateral or multiple, 7 cases were nonfunctional, 11 cases were malignant or malignant (including malignant pheochromocytoma 5 cases). Results CT scan of all tumors were isosceles solid mass with centimeter or irregular liquefaction, necrosis and cystic degeneration. Even a lower density, and calcification. After strengthening the solid part of the obvious. Conclusions (1) The special type of pheochromocytoma has high malignant rate. (2) CT location, high qualitative accuracy, but unless there is a clear infiltration and metastasis signs, still can not distinguish between benign and malignant. The size of the tumor on the difference between benign and malignant only as a reference index. No functional diagnosis more difficult to be combined with laboratory and other tests clear