64排螺旋CT双期增强扫描诊断腮腺肿瘤的影像病理分析

目的：探讨腮腺肿瘤的CT增强特点及其病理基础,提高对不同病理类型腮腺肿瘤的影像特征认识。方法：搜集本院30例经手术病理证实的腮腺肿瘤的CT检查资料,所有病例术前均行64排螺旋CT平扫和双期增强扫描。分析肿瘤的CT增强特征,测量平扫和双期增强的CT值,并进行统计分析。结果：各类型腮腺肿瘤平扫均为等或稍低密度结节,其中腺淋巴瘤平扫密度最高,腺淋巴瘤和基底细胞瘤可见明显的囊变。增强特点：多形性腺瘤表现为缓慢持续强化,腺淋巴瘤表现为早期显著强化及快速流出,基底细胞瘤表现为早期显著持续强化,恶性肿瘤表现为延迟显著持续强化;腺淋巴瘤的动脉期CT值明显高于较其他类型的肿瘤,差异有统计学意义（P〈0.05）,各类型肿瘤静脉期CT值差异无统计学意义（P〉0.05）。结论：腮腺多形性腺瘤、腺淋巴瘤、基底细胞瘤及恶性肿瘤各有其不同的强化特点。腮腺良恶性肿瘤的动态增强特点有明显的差异。

Analysis of 64-slice dual-phase enhanced CT manifestations in the diagnosis of parotid tumors correlated with pathology

Objective：To review the dual-phase enhanced CT features of parotid tumor and to correlate with pathology,in order to improve the knowledge of the imaging characteristics of parotid tumors.Methods：The CT materials of 30 patients with surgery and pathology confirmed parotid tumor were collected.All patients underwent plain and dual-phase contrast enhanced scanning before surgery with a 64-slice CT.The CT attenuation of plain and enhanced CT was measured and the enhancement patterns of the tumors were assessed and statistically analyzed.Results：Parotid tumors of different pathology subtypes showed iso-or slightly hypo-atttenuated nodule on CT plain-scan,with adenolymphoma as the highest,adenolymphoma and basal cell tumor had significant cystic change.On dual-phase enhanced CT,pleomorphic adenoma showed slow yet persistent enhancement,adenolymphoma showed early intense enhancement but washed out quickly.Basal cell tumor showed early persistent intense enhancement while the malignant tumors showed delayed persistent intense enhancement.At arterial phase,the increase of CT attenuation of adenolymphoma was obviously higher than the others,with significant statistical difference（P0.05）.The changes of CT attenuation in all the types of tumor had no statistical difference at venous phase（P0.05）.Conclusion：Pleomorphic adenoma,adenolymphomas,basal cell tumor and malignant parotid tumor showed different patterns of enhancement after contrast administration,and the dual-phase contrast-enhanced imaging features between benign and malignant parotid tumors had significant differences.