Objective to study the features of vascular endothelial growth factor (VEGF) expression and microvascular densities (MVD) count in pediatric malignant liver tumors.

目的研究小儿原发性肝脏恶性肿瘤中血管内皮生长因子(VEGF)和微血管密度(MVD)的特点。

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Results The sensitivity, specificity and accuracy of diagnosing malignant liver tumors by contrast-enhanced harmonic ultrasonography with low mechanical index were 96%? 90.7%? 93.8% respectively.

结果低机械指数谐波超声造影对恶性病变诊断的的敏感性、特异性和准确性分别为96%、90.7%和93.8%。

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The false negative rate of malignant liver tumors in the first biopsy procedure guided by conventional ultrasound was 9.4% (21/224).

恶性肿瘤首次常规超声引导穿刺活检假阴性率为9.4%（21/224）。

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