Objective To investigate the characteristics of computed tomography(CT)and magnetic resonance imaging(MRI)of focal peliosis hepatis(PH).Methods From January 1,2015 to December 31,2022,a total of 8 PH patients(10 lesions)diagnosed pathologically in Yueqing People's Hospital were collected.The location,size,and shape of the lesions,as well as the CT(4 patients with 4 lesions)and MRI(5 patients with 7 lesions)characteristics of the patients were analyzed.Descriptive method was used for statistical analysis.Results Among the 8 PH patients,6 patients had lesions located in the right lobe of the liver,1 in the left lobe of the liver,and 1(3 lesions)in both left and right lobes of the liver.Eight lesions were round or round-like,and 2 lesions were irregularly shaped.The median maximum diameter of the lesions was 4.2 cm(ranged from 2.2 to 9.3 cm),of which the maximum diameters of 2 lesions were less than 3.0 cm,those of 6 lesions were 3.1 to 5.0 cm,and those of 2 lesions were more than 6.0 cm.Nine lesions had clear boundaries,and 1 lesion had blurred boundary;9 lesions had capsule,1 lesion had no capsule;1 lesion had blood vessels passing through it.The CT plain scan of 4 patients(4 lesions)showed that 3 lesions had uniform density and 3 lesions had low density,the CT enhancement showed that 2 lesions were significantly enhanced in the arterial phase,3 lesions were sustained moderately enhanced in the portal phase,and 2 lesions were sustained mildly enhanced in the delayed phase.The MRI plain scan of 5 patients(7 lesions)showed uniform signals in 6 lesions,low signal in 3 lesions and equal signal in 4 lesions on T1-weighted images,high signal in 6 lesions on T2-weighted images,high signal in 3 lesions and equal signal in 4 lesions on diffusion-weighted images.The MRI enhancement showed that 4 lesions were significantly enhanced in the arterial phase,5 lesions were sustained moderately enhanced in the portal phase,and 6 lesions showed sustained mild enhanced in the delayed phase.Conclusion The PH lesions are round or round-like,with clear or unclear boundaries and uniform or uneven density,and are characterised by low density on CT and MRI plain scan,low signal on T1-weighted images,and high signal on T2-weighted images and diffusion-weighted images,and moderate or significant sustained enhancement on CT and MRI enhancement.
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