造影增强内镜超声对胰腺病变定量分析价值的初步探讨

目的 通过定量分析造影剂增强后EUS影像的不同特征,为胰腺病变的影像鉴别诊断提供客观依据.方法 对32例临床或其他影像检查疑有或确诊胰腺良、恶性占位病变、慢性胰腺炎的患者以及19例因其他上消化道原因行EUS检查的胰腺正常患者为检查对象,观察造影增强EUS检查时感兴趣区域的血流灌注增强特征,同时使用造影分析软件进行定量分析.以EUS引导下细针穿刺细胞学和（或）组织病理学结果、手术病理结果为最终诊断.结果 造影增强EUS后定量分析显示,19例正常胰腺的峰值强度（PI）值为0.648±0.174,通过比较,发现其与胰腺癌和胰腺囊性病灶的PI值之间的差异具统计学意义,且通过ROC曲线得出正常胰腺与胰腺癌之间PI值的最佳诊断临界值为0.505,诊断敏感度、特异度分别为100.0%、84.2%.6例慢性胰腺炎PI值较大,为0.772±0.106.在胰腺占位性病灶中,胰腺癌与胰腺囊性病灶及胰腺内分泌肿瘤之间PI值的差异亦具统计学意义,且通过ROC曲线得出胰腺癌与胰腺囊性病灶之间PI值的最佳诊断临界值为0.195,诊断敏感度、特异度分别为85.7%、87.5%.14例胰腺癌的PI值为0.321±0.119,4例胰腺内分泌肿瘤的PI值为0.763±0.115.通过病灶内部和周围正常胰腺实质的显影时间、达到峰值强度时间的比较,78.6%的胰腺癌显示为慢进快出型,而胰腺内分泌肿瘤均为快进快出型.8例胰腺囊性病变的PI值为0.181±0.036,且内部无血流信号强弱变化趋势.结论 造影增强EUS对胰腺病变的定量分析为基于EUS影像的胰腺病变鉴别诊断提供了更为客观的依据,有望成为一种新的EUS下胰腺病变鉴别诊断的影像学手段.

Contrast enhanced EUS for pancreatic diseases

Objective To provide an objective basis for differential diagnosis of pancreatic diseases through quantitative analysis of the different features of contrast-enhanced endoscopic ultrasonography (CE-EUS). Methods A total of 32 patients with suspected or confirmed pancreatic neoplasms or chronic pancreatitis and 19 patients who underwent EUS due to other digestive problems other than pancreatic disease were enrolled. Features of blood perfusion of the regions of interest during CE-EUS were analyzed quantitatively. The findings were compared with cytological and/or histopathological results of EUS-FNA and/or surgery.Results Quantitative analysis of CE-EUS showed peak intensity (PI) value of 19 normal pancreas was 0.648 ±0. 174, which was statistically different from that of pancreatic cancer and pancreatic cystic lesions. Based on ROC, the cutoff of differential diagnosis was 0. 505, and the sensitivity and specificity were 100. 0% and 84. 2%, respectively. PI value of 6 chronic pancreatitis was the highest (0. 772 ±0. 106). In pancreatic neoplams, PI values of pancreatic carcinoma, pancreatic cyst and pancreatic endocrine tumors were significantly different. Based on a cutoff of 0. 195, the sensitivity and specificity of differentiation of pancreatic carcinoma and pancreatic cyst were 85.7% and 87.5%, respectively. PI value of 14 pancreatic carcinoma and that of 4 pancreatic endocrine tumors were 0. 321 ± 0. 119 and 0. 763 ± 0. 115, respectively. Through the comparison between the AT and TTP of the focal lesions and surrounding pancreatic parenchyma, 78.6% pancreatic carcinoma showed slow falling-in and rapid wash-out and all the endocrine tumors showed rapid falling-in and rapid wash-out. The PI value of 8 patients with pancreatic cyst was 0. 181 ±0. 036, with no enhanced blood flow in the cyst. The TIC was a straight line. Conclusion CE-EUS with quantitative analysis is a promising method that can be a more objective basis in the differential diagnosis of pancreatic diseases.