多层螺旋CT双期扫描对腮腺腺淋巴瘤的诊断评价

目的探讨腮腺腺淋巴瘤CT双期扫描的表现特点。方法收集经手术病理证实者16例，在注射造影剂后的30s和120s扫描，分别为早期和延迟期，对CT扫描的肿瘤层面行实质部分的密度测量。结果CT表现为病灶大部分位于腮腺尾叶，最大直径为2—5cm，边界清楚，密度均匀或不均匀，形态圆形，椭圆形，不规则分叶状。增强后可不均匀强化，早期病灶实质部分明显强化，延迟期下降，比较平扫、早期及延迟期强化差值有显著统计学差异。结论双期CT扫描病灶在增强后早期明显强化，延迟期下降，囊状低密度部分无强化为腮腺腺淋巴瘤的特征表现。

The MDCT tow-phase diagnosis of Parotid adenolymphomas

Objective To investigate the characteristics of CT two-phase of parotid adenolymphomas. Methods 16 Patients with parotid adenolymphomas underwent two-phase CT.The histopathologic diagnosis was obtained by means of surgical resection in all patients.The MDCT scans were obtained at early and derayed phases with scanning delays of 30 and 120 seconds,respectively.The attenuation change in the tumor parenchyma was measured.Results The most of parotid adenolymphomas were located in the lower-posterior part of the gland.The maximum diameters of the tumors were 2-5 cm,lesions were round,oval or lobulated in shape,well-defined,homogeneous or heterogeneous soft tissue mass.Two-phases CT showed increase in attenuation in the early phases,and decrease in attenuation in the delayed phases.The change of CT numbers was significantly different between the plain scan and the early phases and delayed phases.Conclusion The characteristics of the parotid adenolymphomas with the two-phases CT scanning showed strong enhancement in the early phases,and decrease enhancement in the delayed phases,and cystic area showed unenhancement.