Aim:To evaluate the dynamic CT,MRI,and clinicopathologic characteristics of rare hepatic malignant tumors(HRMTs),improving the understanding and diagnosis of the tumors.Methods:A retrospective analysis of 54 cases of HRMTs diagnosed by pathology in our hospital during January 1,2005 to September 1,2011.Results:The types of tumors included hepatic sarcoma(n = 8),malignant lymphoma(n = 4),malignant fibrous histiocytoma(MFH,n = 7),malignant melanoma(MM,n = 4),squamous cell carcinoma(SCC,n = 5),primary clear cell carcinoma of the liver(PCCCL,n = 7),stromal tumors(ST n = 4),hepatoblastoma(HB,n = 8),carcinoid(n = 6),primary primitive neuroectodermal tumor(pPNET,n = 1).Age of the patients ranged from 1 to 79 years(mean = 46.7 years).There were more men in this group(34/54).Symptoms of HRMTs show no specificity.Except PCCCL and HB,the serum AFP of most HRMTs was negative.43 patients had a single hepatic mass,and 11 patients had multiple hepatic masses.Diameters ranged from 2 to 15 cm(mean = 7.7 cm).Precontrast CT revealed that most masses had uneven density(n = 46)and ill-demarcated margin(n = 37).Enhanced CT showed most lesions unevenly enhanced(n = 49),of which PCCCL had a prompt enhancement in the arterial phase and rapid wash-out on the portal venous phase and delayed phase; malignant lymphoma and ST had slight enhancement,MFH and undifferentiated embryonal sarcoma had gradual delayed enhancement.Most masses had low-signal on T1WI and high-signal on T2WI,while MM had high-signal on T1WI and lowsignal on T2WI.Conclusions:Although there is frequent overlap in the CT,MRI,and clinicopathologic appearances between the raremalignant tumors,some HRMTs have characteristicimaging features that can suggest a specific diagnosis.