Purpose : To evaluate the contrast enhancement patterns and mass detection rate of metastatic adenocarcinomaof the liver in the early and late phase of spiral bolus dynamic CT. Materials and Methods : Two-phase spiralbolus dynamic CT of the liver was performed on 34 patients with clinically or pathologically proved metastaticadenocarcinoma of the liver after bolus administration of 120 mL of contrast material intravenously. CT scanningwas started at 45 seconds and 6 minutes after beginning of injection in 23 patients, and at 35 seconds and 3minutes in another 11 patients. The enhancement patterns of the tumors were classified into 6 types compared withattenuation of surrounding normal liver parenchyma, as diffusely high, peripherally high, centrally high, mixed,iso, diffusely low. The enhancement patterns of 76 tumors in 34 patients were analysed. Results : In the earlyphase, peripherally high attenuation was seen in 34(45%) and diffusely low attenuation in 23(30%). In the latephase, low attenuation was seen in 27(36%) followed by iso and mixed in 14(18%), in each, and peripherally high in13(17%). The appearances of enhancement pattern from the early to the late phase were variable. 12(16%) werediffusely low in both phases, 11(14%) were peripherally high in the early phase and diffusely low in the latephase, and 10(13%) were peripherally high in both phases. Number of tumors lesions detected were more in the earlyphase in 12(35%)patients, and in the late phase in 3(9%)patients. Conclusion : Metastatic adenocarcinoma of theliver showed variable enhancement patterns in the early and late phases of spiral bolus dynamic CT, although mostcommon pattern was peripherally high in early phase, and diffusely low in the late phase. The detection rate ofmasses was higher in early phase than late. The two-phase spiral bolus dynamic CT should be good method indetection and differential diagnosis of metaststic adenocarcinoma of the liver.