Idiopathic chronic pancreatitis with periductal lymphoplasmacytic infiltration: clinicopathologic features of 35 cases.
To clarify clinicopathologic features of idiopathic chronic pancreatitis with lymphoplasmacytic infiltration, we carried out a study of 35 cases. There were two histologic groups, which we have designated lymphoplasmacytic sclerosing pancreatitis and idiopathic duct-centric chronic pancreatitis. Lymphoplasmacytic sclerosing pancreatitis (22 cases) was a fibrosing process with diffuse lymphoplasmacytic infiltrates involving pancreatic lobules and ducts, adipose tissue, blood vessels, and common bile duct. Obliterative phlebitis was found in every case except for one. The histologic features were similar to other idiopathic fibrosclerosing disorders, and one patient also had retroperitoneal fibrosis. Affected patients tended to be elderly men. Idiopathic duct-centric chronic pancreatitis (13 cases) was characterized by inflammatory infiltrates (including neutrophils) that were denser in the lobules than in interlobular fibrotic areas. Neutrophils were also prominent in the ducts, and destruction of the duct epithelium was commonly seen. Patient ages were more broadly distributed than in lymphoplasmacytic sclerosing pancreatitis. Two patients had inflammatory bowel disease. We conclude that idiopathic chronic pancreatitis with lymphoplasmacytic infiltration, sometimes called autoimmune pancreatitis, consists of at least two different processes. One of these, lymphoplasmacytic sclerosing pancreatitis, is a histologically unique lesion and could be a pancreatic manifestation of idiopathic fibrosclerosing disorders.
Notohara
Kenji
K
Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN 55905, USA. smyrk.thomas@mayo.edu
Burgart
Lawrence J
LJ
Yadav
Dhiraj
D
Chari
Suresh
S
Smyrk
Thomas C
TC
D000293:Adolescent; D000328:Adult; D017677:Age Distribution; D000368:Aged; D015703:Antigens, CD / Q000378:metabolism; D002908:Chronic Disease; D005260:Female; D006801:Humans; D007124:Immunoenzyme Techniques; D008214:Lymphocytes / Q000378:metabolism / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D010183:Pancreatic Ducts / Q000378:metabolism / Q000473:pathology*; D010195:Pancreatitis / Q000378:metabolism / Q000473:pathology*; D010950:Plasma Cells / Q000378:metabolism / Q000473:pathology*; D012189:Retrospective Studies; D012598:Sclerosis / Q000378:metabolism / Q000473:pathology
D015703:Antigens, CD