Inflammatory Pseudotumor of the Liver Diagnosed as Metastatic Liver Tumor in Patient with Islet Cell Tumor of the Pancreas

Abstract

An asymptomatic 48-year-old woman diagnosed with pancreatic tumor detected in abdominal ultrasonography (US) and no abnormal laboratory test, findings was found in enhanced computed tomography (CT) to have a hypervascular mass in the body of the pancreas and late-phase enhanced masses at S4 and S8 of the liver. Arterial port graphy (CTAP) showed the liver mass to have a perfusion defect, arteriography (CTA) showed enhancement. Gadolinium ethoxybenzyl magnetic resonance imaging (Gd-EOB-MRI) showed early enhanced masses at S4 and S8 of the liver that did not show late-phase perfusion defects. Following distal pancreatectomy and partial liver resection, histological examination showed an islet cell tumor of the pancreas and a liver tumor consisting of proliferative fibrous tissue and infiltrative diffuse inflammatory cells definitively diagnosed as inflammatory pseudotumor of the liver.