Inflammatory pseudotumor of the liver is a benign disease which is histologically characterized by plasma cell infiltration and reactive fibrotic inflammation. Differentiating this disease from malignant tumor is not easy. The authors report a case of inflammatory pseudotumor mimicked as intrahepatic cholangiocarcinoma. A 74-year-old man visited the emergency department complaining of jaundice and myalgia which have lasted for 1 to 2 weeks. After computed tomography (CT) scan and magnetic resonance imaging of the liver, he was initially diagnosed with intrahepatic cholangiocarcinoma, but was ultimately found to be inflammatory pseudotumor after pathologic examination of the liver tissue. His symptoms improved after a course of antibiotic therapy and conservative treatment, and the lesion disappeared on follow-up CT scan.
Aged ; Cholangiocarcinoma* ; Emergency Service, Hospital ; Follow-Up Studies ; Granuloma, Plasma Cell* ; Humans ; Inflammation ; Jaundice ; Liver* ; Magnetic Resonance Imaging ; Myalgia ; Plasma Cells ; Tomography, X-Ray Computed

Gallbladder cancer (GBC) is the most common primary hepatobiliary carcinoma and the sixth most common gastrointestinal malignancy. Adenocarcinoma accounts for the vast majority of GBCs (80–95%), whereas squamous cell carcinoma constitutes only 0–3.3% of GBCs. A 69-year-old man was suspected to have GBC with a cholecystoduodenal fistula on an abdominal computed tomography scan. He underwent esophagogastroduodenoscopy, which revealed that the duodenum was obstructed by the mass. Duodenal and biliary stents were successfully placed using endoscopic retrograde cholangiopancreatography. Pathology obtained from the duodenum revealed the mass to be a squamous cell carcinoma.
Adenocarcinoma ; Aged ; Carcinoma, Squamous Cell* ; Cholangiopancreatography, Endoscopic Retrograde ; Duodenum ; Endoscopy, Digestive System ; Epithelial Cells* ; Gallbladder Neoplasms ; Gallbladder* ; Humans ; Intestinal Fistula* ; Pathology ; Stents