title: [An epidermoid cyst derived from an intrapancreatic accessory spleen].
abstract: A 43-year-old female patient had high levels of CA19-9 marker; an abdominal ultrasound revealed a cyst. Further investigations with computed tomography (CT), magnetic resonance imaging, and endoscopic ultrasound CT identified a multilocular cystic lesion on the pancreatic tail. An abnormal wall was noted, and different signal strengths were measured in each cyst. Thus, a mucinous cystic tumor was diagnosed, and distal pancreatectomy combined with splenectomy was performed. During the surgery, we identified a multilocular pancreatic cyst with internal bleeding at its distal end. The lesion was ultimately diagnosed as an epidermoid cyst of an intrapancreatic accessory spleen. This diagnosis was based on the histological observation that the vascular construction of the cystic wall was equivalent to that of the spleen, and that its internal tissue was covered by squamous epithelium.
authors.affiliation: Department of Gastroenterology, Hiroshima Red Cross Hospital & Atomic-Bomb Survivors Hospital.
authors.forename: Fumi
authors.initials: F
authors.lastname: Shinohara
authors.forename: Yoshinari
authors.initials: Y
authors.lastname: Furukawa
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Itsuki
authors.forename: Ayaka
authors.initials: A
authors.lastname: Sakano
authors.forename: Mutsumi
authors.initials: M
authors.lastname: Hananoki
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Kurushima
authors.forename: Nori
authors.initials: N
authors.lastname: Matsumoto
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yamamoto
authors.forename: Megumu
authors.initials: M
authors.lastname: Fujihara
mesh_terms: D000328:Adult; D002828:Choristoma / Q000473:pathology*; D004814:Epidermal Cyst / Q000473:pathology*; D005260:Female; D006801:Humans; D010182:Pancreatic Diseases / Q000473:pathology*; D013154:Spleen