Abstract
A 75-year-old female was admitted for upper abdominal pain. Abdominal computed tomography and MRI showed a mass lesion in posterior segment of the liver measuring 5 cm, where no mass had existed 2 months before. On DWI, the intensity of the mass lesion was high and homogenous. Angiography revealed portal flow absence in the mass lesion. Malignancy, such as intrahepatic cholangiocarcinoma or cystadenocarcinoma of the liver could not be ruled out based on the radiologic examination. The patient's general status became worse due to continuing high fever and the rapid growth of the mass, so we decided to remove the tumor surgically. S6 hepatectomy was performed. Histopathological examination revealed that the tumorous lesion consisted of collagenous stroma in which severe fibrosis had occurred. Infiltration of inflammatory cells, mainly by plasma cells and lymphocytes, were observed. This tissue was diagnosed as an inflammatory pseudotumor (IPT) of the liver. The postoperative course was uneventful, and the patient was discharged 15 days after operation. Similar to the many reported cases of hepatic IPT, this case presented difficulty in excluding malignancy. But to our knowledge, this is the first reported hepatic IPT case which presented high intensity of the mass lesion on DWI-MRI.
