Internal Medicine
Online ISSN : 1349-7235
Print ISSN : 0918-2918
CASE REPORTS
Inflammatory Pseudotumors of the Pancreas and Liver with Infiltration of IgG4-Positive Plasma Cells
Kazushige UchidaSohei SatoiHideaki MiyoshiDaisaku HachimineTsukasa IkeuraMasaaki ShimataniMitsunobu MatsushitaMakoto TakaokaSoichiro TakaiKiyoshi AshidaKazuichi Okazaki
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JOURNALS OPEN ACCESS

Volume 46 (2007) Issue 17 Pages 1409-1412

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Abstract

Recently, it has been reported that autoimmune pancreatitis (AIP) can be complicated with various extrapancreatic lesions. Here, we report a very rare case of pancreatic and hepatic inflammatory pseudotumor (IPT) with the infiltration of IgG4-positive plasmacytes. The patient showed pancreatic and hepatic masses with elevated levels of serum IgG4. Endoscopic retrograde cholangiopancreatography revealed narrowing of the intrapancreatic bile duct. Fluorine-18fluorodeoxyglucose positron emission tomography suggested pancreatic cancer with hepatic metastasis. Histopathologic findings showed fibrosis and infiltration of IgG4-positive plasmacytes, suggesting IPT. The present case suggests a possible common mechanism in the development of AIP and IPT of the liver.

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© 2007 by The Japanese Society of Internal Medicine
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