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AIM:To investigate the specific value of resistance index(RI) in color Doppler ultrasonography in the diagnosis offocal hepatic lesions.METHODS:Eight hundred patients with 893 hepatic solidlesions were studied with color Doppler flow imaging (CDFI)and pulsed Doppler,including 644 malignant cases (596 primarymalignant liver tumors,and 48 metastatic liver tumors),156benign cases.All were confirmed by operation and pathology.RESULTS:The detection rate of arterial flow in malignanttumors was 92%,and 52% in benign lesions.Dopplerspectrum analysis showed that the resistance index inprimary malignant tumors was 0.75±0.12,0.73±0.09 inmetastatic tumors,and was below 0.6 in benign lesions.The difference was significant (P<0.001).This differencewas related with its histopathologic structure.CONCLUSION:The arterial flow with RI≥0.6 identified byCDFI within the liver lesion can be regarded as a criterion ofmalignant tumors,RI<0.6 can be regarded as benign disorders.RI is useful in differential diagnosis of liver neoplasms.
AIM: To investigate the specific value of resistance index (RI) in color Doppler ultrasonography in the diagnosis of offocal hepatic lesions. METHODS: Eight hundred patients with 893 hepatic solidlesions were studied with color Doppler flow imaging (CDFI) and pulsed Doppler, including 644 malignant cases (596 primary malignant liver tumors, and 48 metastatic liver tumors), 156 benign cases. All were confirmed by operation and pathology .RESULTS: The detection rate of arterial flow in malignant tumors was 92%, and 52% in benign lesions. Dupplerspectrum analysis showed that the resistance index in primary malignant tumors was 0.75 ± 0.12, 0.73 ± 0.09 inmetastatic tumors, and was below 0.6 in benign lesions. the difference was significant (P <0.001). This difference was related with its histopathologic structure. CONCLUSION: The arterial flow with RI ≥ 0.6 identified byCDFI within the liver lesion can be regarded as a criterion of malignant tumors, RI <0.6 can be regarded as benign disorders. RI is useful in differential diagnosis of liver neoplasms.