title: [Mass-forming autoimmune pancreatitis caused after resection of an IgG4-related renal pelvic lesion].
abstract: A 64-year-old man was found to have a 15-mm tumor in the pancreatic tail by CT angiography 1 year after resection of a left renal pelvic tumor. Clinically, the tumor was preoperatively suspected to be autoimmune pancreatitis. However, surgical resection was performed under a diagnosis of pancreatic ductal cancer, because atypical epithelial cells were detected by endoscopic ultrasonography-guided fine needle aspiration (EUS-FNA). Pathological examination of the tumor revealed a mass-forming autoimmune pancreatitis. Mass-forming autoimmune pancreatitis is often difficult to preoperatively differentiate from pancreatic carcinoma. Response to steroid treatment and the detection of extrapancreatic lesions may contribute to an accurate diagnosis, thereby avoiding unnecessary surgery.
authors.affiliation: Department of Gastroenterology, National Hospital Organization Kure Medical Center. tomoki.kobayashi1124@gmail.com
authors.forename: Tomoki
authors.initials: T
authors.lastname: Kobayashi
authors.forename: Atsushi
authors.initials: A
authors.lastname: Yamaguchi
authors.forename: Sohei
authors.initials: S
authors.lastname: Yamamoto
authors.forename: Haruki
authors.initials: H
authors.lastname: Kimura
authors.forename: Keiichi
authors.initials: K
authors.lastname: Masaki
authors.forename: Mayuko
authors.initials: M
authors.lastname: Hirata
authors.forename: Toshio
authors.initials: T
authors.lastname: Kuwai
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Kono
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kohno
authors.forename: Kazuya
authors.initials: K
authors.lastname: Kuraoka
authors.forename: Kiyomi
authors.initials: K
authors.lastname: Taniyama
mesh_terms: D001327:Autoimmune Diseases / Q000175:diagnosis* / Q000473:pathology; D003937:Diagnosis, Differential; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood*; D007682:Kidney Pelvis; D008297:Male; D008875:Middle Aged; D010180:Pancreatectomy; D010190:Pancreatic Neoplasms / Q000175:diagnosis; D010195:Pancreatitis / Q000175:diagnosis* / Q000473:pathology
chemical_list: D007074:Immunoglobulin G