Imaging appearance of hepatic inflammatory myofibroblastic tumor

Objective: To describe the CT and MR imaging features of hepatic inflammatory myofibroblastic tumor (IMT). Methods: The CT (n=12) and MRI (n=2) findings of pathologically proved hepatic IMT in 12 patients were retrospectively analyzed. Results: All the tumors of the 12 patients were solitary and located in right hepatic lobe. Six tumors were solid and 4 tumors were solid-cystic. The other 2 tumors were periportal soft-tissue infiltration. The tumors appeared as solid or solid-cystic hypodense mass on CT images. The lesions were dark in T1-weighted sequences and slightly bright on T2-weighted sequences. There was homogeneous or inhomogeneous moderate to significant enhancement in solid portion of the tumors. Honeycomb-like enhancement was demontrated both in the peripheral part and at the intratumoral septa of the solid-cystic mass. Conclusion: CT and MRI can provide helpful information for the clinical diagnosis and differential diagnosis of hepatic IMT. (authors)