Tumor in the liver: Six inflammatory pseudotumor patient

Inflammatory pseudotumor (IPT) is a rare liver disease confused with liver tumors. It is a disease that should be known in the differential diagnosis for clinicians as the correct diagnosis of IPT will prevent unnecessary surgery. Demographic datas, diagnoses and imaging modalities of six patients with radiologically and/or histopathologically diagnosed hepatic IPT between 2016 and 2023 were retrospectively analyzed. Four out of six patients were female and median age was 57.5 (47-66). C-reactive protein was higher in four patients, and carbohydrate antigen 19.9 level was higher in one patient. We used magnetic resonance imaging (MRI) for diagnosis in five patients. Only in one patient computed tomography was enough for diagnosis. Tumor locations were segment 5 for two patients, segment 7-8 in two patients, segment 7 in one patient, and 8 in one patient. Liver biopsy was performed in five patients because it could not be distinguished from malignancy by imaging methods. Histopathological results of all these biopsies defined as IPT. Initial tumor median size was 31 (17-55) mm. Two patients were operated on. The first one underwent right hepatectomy due to a 2-fold increase in size within 11 months. The second one had a mass indistinguishable from hepatic adenoma by MRI and underwent nonanatomic resection. In one patient, IPT disappeared completely in the 18^th month of follow-up period while it regressed in size in two patients. Two of our patients had a history of recurrent endoscopic retrograde cholangiopancreatography, which we noticed incidentally before IPT was diagnosed. IPTs are liver masses with low malignant potential and may shrink spontaneously during follow-up. We suspected that biliary tract interventions may be the cause of IPT.