AIM:To assess the value of multidetector-row computedtomography(MDCT)in choosing retreatment methods ofhepatocellular carcinoma(HCC)through evaluating theblood supply of low-density area of HCC after transcatheterarterial chemoembolization(TACE).METHODS:Thirty-two patients with HCC after TACEtreatment were examined by plain scanning and hepaticmultidetector-row CT.The location of low-density area onplain scanning and the enhancement patterns on dynamiccontrast-enhanced scanning were observed.At the sametime,three-dimensional CT(3D CT)models of the volumerendering,curved rnultiplanar reformations,surface shadeddisplay and maximum intensity projection reconstruction ofthe hepatic artery and portal vein were performed in 6 cases.RESULTS:In CT plain scanning data,low density areas of32 cases of HCC after TACE treatment were divided intothree types:peripheral,one-side-located and mixed types.In contrast-enhanced CT scans,the blood supply of low-density area was classified into four types:arterial bloodsupply(20 cases),portal blood supply(5 cases),arterialcombined with portal blood supply(5 cases)and poor bloodsupply(2 cases).In 6 cases,the relationship between thelow-density area and branches of hepatic artery as well asportal vein was shown by 3D CT.CONCLUSION:Hepatic MDCT is an effective method forevaluating the blood supply of low-density area andtherapeutic effect of HCC after TACE treatment.Types ofblood supply is helpful for the selection of retreatment. AIM: To assess the value of multidetector-row computed tomography (MDCT) in choosing retreatment methods of hepatocellular carcinoma (HCC) through evaluating the blood supply of low-density area of ​​HCC after transcatheter chemoembolization (TACE). METHODS: Thirty-two patients with HCC after TACEtreatment were examined by plain scanning and hepatic multidextector-row CT. The location of low-density area onplain scanning and the enhancement patterns on dynamic contrast-enhanced scanning were observed. At the same time, three-dimensional CT (3D CT) models of the volume rendering, curved rnultiplanar reformations, surface shaded display and maximum intensity projection reconstruction of the hepatic artery and portal vein were performed in 6 cases. RESULTS: In CT plain scanning data, low density areas of 32 cases of HCC after TACE treatment were divided intothree types: peripheral, one- side-located and mixed types. Contrast-enhanced CT scans, the blood supply of low-density area was classified into four types: ar The portal blood supply (5 cases), arterialcombined with portal blood supply (5 cases) and poor blood supply (2 cases) .In 6 cases, the relationship between thelow-density area and branches of hepatic artery as well asportal vein was shown by 3D CT. CONCLUSION: Hepatic MDCT is an effective method forevaluating the blood supply of low-density area and therapeutic effect of HCC after TACE treatment. Types of blood supply is helpful for the selection of retreatment.