无功能性胰岛细胞瘤的CT诊断

目的 探讨无功能性胰岛细胞瘤(NFICT)的CT表现.方法 回顾性分析经手术并经病理证实的17例NFICT的CT平扫和增强扫描所见.增强剂采用非离子型碘对比剂90 mL,注射流率3mL/s,测量胰腺和肿瘤动、静脉双期CT值.结果 CT扫描全组均发现肿瘤.平扫时肿瘤与胰腺实质比较,2例肿瘤为低密度,11例为混合性低密度,4例为等密度.5例于肿瘤内见限局性钙化.增强扫描17例肿瘤均有程度不同的强化.动脉期明显强化5例,中等强化6例,轻度强化6例.结论 NFICT的CT平扫表现为界限清楚的肿瘤,部分瘤体内有钙化.增强扫描肿瘤均有程度不同的强化,从动脉期到门静脉期呈持续性强化是NFICT的特征性表现.

CT diagnosis of non-functional islet cell tumor

Objective:To explore the CT manifestations of non-functional islet cell tumor（NFICT）Methods:The findings of plain and enhancement CT scanning from 17 cases with NFICT, which were confirmed by the surgeries and pathological sections, were analyzed retrospectively. Ninty ml of non-ioniodine contrast reagent with 3ml/s injection flow rate was employed as the enhancer for measuring the arteriovenous double phase CT value of the pancreas and tumor.Results:Tumors were found in all the cases who received CT scan. Compared with pancreatic substance in the CT plain scan, tumors with low density were found in 2 cases, tumors with mixed low density in 11 cases and tumors with isodensity in 4 cases. Local calcification in tumor was found in 5 cases. Various degrees of strengthening were showed in 17 cases with enhancement scanning. Obvious enhancement in arterial phase presented in 5 cases, moderate enhancement in 6 cases and slight enhancement in 6 cases.Conclusions:CT plain scan of NFICT shows that the tumor margins are clear and some tumors have calcification. All tumors in the CT enhancement scanning show various degrees of enhancement, the persistent enhancement from arterial phase to portal vein phase is the characteristic manifestation of NFICT.