Abstract: Objective To investigate the specific manifestation of hepatic angiosarcoma under computer tomography (CT) and magnetic resonance imaging (MRI).Methods The CT and MRI features of four cases of hepatic angiosarcoma (HA) confirmed by pathology in the Fifth Medical Center of PLA General Hospital in Beijing were retrospectively analyzed.Results All 4 HA patients had multiple lesions. One patient had lesions with scar and hepatic artery crossing. All 4 patients had bleeding within the lesions, which was shown by CT as uneven low-density shadow in the lesions, and by MRI as low intensity signal on T1WI, high intensity signal on T2WI, mixed or slightly high intensity signal on DWI, and high signal on apparent diffusion coefficient (ADC). Dynamic enhanced scanning showed patchy enhancement at the edge or within the lesion at arterial stage in all patients. With time extension, the enhancement range of the lesion increased, namely centripetal or eccentric enhancement.Conclusion The CT and MRI findings of HA have certain imaging characteristics. Features of multiple lesions, internal bleeding, high signal on ADC, centripetal and eccentric enhancement on dynamic enhanced scan indicate hepatic angiosarcoma.

Key words: Hepatic angiosarcoma, Computer tomography, Magnetic resonance imaging