title: Epidermoid cyst in an intrapancreatic accessory spleen: a case report.
abstract: Ectopic splenic tissue in the abdominal cavity is a common entity, with a reported incidence of 10% in the general population. However, an intrapancreatic accessory spleen is a rare disease, and moreover cyst formation in it is exceedingly rare. A 58-year-old woman with a 25-mm multilocular cyst in the tail of the pancreas detected incidentally by ultrasonography was admitted for further evaluation. Because malignancy could not be ruled out, a spleen-preserving distal pancreatectomy was performed. The cut surface of the surgical specimen showed a multilocular cyst surrounded by brown solid tissue resembling normal spleen. Pathological examination revealed it was stratified squamous epithelium and was surrounded by splenic tissue. The final pathological diagnosis was epidermoid cyst in an accessory spleen in the pancreas. This cyst has no characteristic features on diagnostic imaging. Consequently, it is not possible to make a definite preoperative diagnosis in most cases. Epidermoid cyst in intrapancreatic splenic tissue is another lesion to be considered in the differential diagnosis of pancreatic tail tumors.
authors.affiliation: Division of Surgical Oncology, Department of Surgery, Nagoya University, Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, 466-8550, Nagoya, Japan.
authors.forename: Hidetoshi
authors.initials: H
authors.lastname: Kanazawa
authors.forename: Junichi
authors.initials: J
authors.lastname: Kamiya
authors.forename: Masato
authors.initials: M
authors.lastname: Nagino
authors.forename: Katuhiko
authors.initials: K
authors.lastname: Uesaka
authors.forename: Norihiro
authors.initials: N
authors.lastname: Yuasa
authors.forename: Koji
authors.initials: K
authors.lastname: Oda
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Arai
authors.forename: Hideki
authors.initials: H
authors.lastname: Nishio
authors.forename: Yuji
authors.initials: Y
authors.lastname: Nimura
mesh_terms: D019160:Endosonography; D004814:Epidermal Cyst / Q000000981:diagnostic imaging / Q000473:pathology*; D005260:Female; D006801:Humans; D008875:Middle Aged; D013154:Spleen / Q000002:abnormalities* / Q000000981:diagnostic imaging; D013158:Splenic Diseases / Q000000981:diagnostic imaging / Q000473:pathology*