Abstract: Objective To explore the CT and MRI imaging characteristics of patients with primary liver lymphoma and improve the diagnostic level of this disease. Methods A retrospective analysis was performed in the Fifth Medical Center of Chinese People's Liberation Army (PLA) General Hospital, from May 2012 to September 2019. Results In this group of 11 cases, 9 cases were with solitary lymphoma, and 1 with multiple lymphoma, CT plain scan showed low and uniform density, with clear boundary. MRI showed low signal on T1WI, high signal on T2WI, high signal on DWI. 6 cases showed homogeneous signal, enhanced scan showed mild enhancement. In 6 cases, there were vessels passing through the lesions without involvement, showing “floating vessels sign”. In 2 cases, there were annular enhancement around the lesions, showing “target sign”. In 2 cases, there were delayed enhancement of central scar. Conclusion The CT and MR images of primary liver lymphoma showed clear lesion boundaries, mainly uniform density/signal, characteristic “vascular floating sign” with uneven density/signal. The enhancement of “target sign” and patchy enhancement should be considered as the possibility of this disease.

Key words: Primary, Liver, lymphoma, Computer tomography, Magnetic resonance imaging