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01.12.2015 | Case report | Ausgabe 1/2015 Open Access

BMC Surgery 1/2015

Large retroperitoneal isolated fibrous cyst in absence of preceding trauma or acute pancreatitis

BMC Surgery > Ausgabe 1/2015
Julie Ahn, Manju D Chandrasegaram, Khaled Alsaleh, Benjamin L Woodham, Adrian Teo, Amithaba Das, Neil D Merrett, Christos Apostolou
Wichtige Hinweise

Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

JA was involved in the conception of the case report, drafted the manuscript and subsequent revisions while critically reviewing the literature. MD, KA, BW, AT, AD, NM, and CA were involved in the conception and design of the case report and ongoing critical revisions of the manuscript. All authors gave final approval of the version to be published.



Isolated retroperitoneal cystic masses are uncommon with an estimated incidence of 1/5750 to 1/250,000. The majority present with size related symptoms, complications, or a mass. Approximately a third of patients are asymptomatic and are diagnosed incidentally.
Aetiologies of retroperitoneal cystic masses (RPC) include mesenteric, omental, splenic and enteric duplication cysts. Neoplastic RPCs can be divided into epithelial (mucinous or serous cystadenoma), mesothelial (mesothelioma), germ cell (cystic teratoma) and cystic changes in a solid neoplasm (paraganglioma, neurilemmoma, sarcoma).

Case presentation

A 53 year-old man presented to us with abdominal pain related to a large mass in his left upper quadrant with associated anorexia and weight loss. He gave no history of previous trauma and denied having symptoms or a history of pancreatitis. He said he had felt this mass increasing in size over the course of several years.
Clinical examination of his abdomen revealed a large firm left sided mass extending to his left upper quadrant.
Imaging with computed tomography (CT) and magnetic resonance imaging cholangio-pancreatogram (MRCP) revealed a 13.7 cm × 12.2 cm × 10.9 cm cystic lesion in the retroperitoneum which was separate from the kidney, pancreas, spleen and bowel. At laparotomy, this mass was easily dissected from the surrounding viscera and was excised completely intact.
Histopathological assessment found the mass to be a large fibrous pseudocyst with no epithelial lining.


We present a rare case of an isolated large retroperitoneal fibrous pseudocyst unrelated to previous pancreatitis which was successfully managed with surgery.
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