肾上腺节细胞神经瘤的CT表现

CT Manifestations of Adrenal Ganglioneuroma

目的探讨肾上腺节细胞神经瘤的CT表现。方法回顾性分析经病理证实的14例肾上腺节细胞神经瘤CT平扫及增强表现特点。结果14例病灶大小平均为（41．3±28．5）mm（23．8～74．3mm），境界清楚，呈椭圆形（7／14）、水滴形（3／14）、不规则形（4／14）；瘤内钙化（3／14），包膜钙化（1／14），压迫血管但无狭窄（4／14）。肿瘤平扫为均匀的低密度[（28．3±9．8）HU]，增强扫描主要有3种类型：（1）动、静脉期均为均匀轻度强化，强化幅度均〈20HU（5／14）。（2）动、静脉期为不均匀轻度强化，不均匀区呈曲线状、片絮状中度强化，强化幅度20～50HU（8／14）。第（1）、（2）两种类型的轻度强化区（增值〈20HU）占瘤体总容积80％以上。（3）动、静脉期呈中度以上渐进性强化（1／14）。结论肿瘤呈较低密度[（28．3±9．8）HU]表现，轻度强化区在瘤体总容积的高占比（〉80％）是肾上腺节细胞神经瘤的CT特征表现。

Objective To explore the imaging findings of adrenal ganglioneuroma. Methods CT findings on both plain and dynamic enhanced CT scanning of 14 patients with pathologically-proved adrenal ganglioneuromas were retrospec- tively analyzed. Results The diameter of tumors was （41.3 ± 28.50 ） ram, ranged from 23.8 to 74.3 mm. All tumors were well defined. The lesion＇ s shape was oval （ n = 7）, water drop （ n = 3 ） or irregular （ n = 4）. Other findings included calcification within the tumor （n = 3 ）, capsule calcification （n = 1 ） and vessel compression with no stenosis （n =4）. The lesion was hypo-density （28.3 ±9.8 HU） on plain scans. On enhanced CT scans the lesions could be divided into three types. （1） The lesions showed slight homogeneous enhancement （ 〈 20 HU） at both arterial and venous phases （n = 5）. （2） The lesions showed patch slight heterogeneous enhancement （20 -50 HU） at both arterial and venous phases （n = 5 ）. （ 3 ） The lesion showed moderate enhancement, which was increasing with time, in both arterial and venous phases （ n = 1 ）. Conclusion The sign of low-density and the high pereentage of relatively-low enhancement area （ 〉 80% ） are the characteristic CT features of adrenal ganglioneuroma.