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Plain upright abdominal film showing displaced bowel loops to the left with large amount of stool in the colon.
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 A supine and upright abdominal film showed bowel loops displaced to the left with a large amount of stool in the colon ( Fig. 1 ).
Abdominal computed tomography shows a large right retroperitoneal cystic lesion with displacement of the right kidney and bowel loops to the left.
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The cyst was displacing the right kidney and right colon medially ( Figs. 2 and 3 ).
Abdominal computed tomography (sagittal plane) showing a giant retroperitoneal cyst.
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The cyst was displacing the right kidney and right colon medially ( Figs. 2 and 3 ).
Laparoscopic view of the cyst wall noted behind the posterior peritoneum.
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Intraoperatively, the retroperitoneal location of the cyst was confirmed as the cyst wall was separated from visceral peritoneum with ease ( Fig. 4 ).
Macroscopic view of the surgical specimen shows thick cystic wall.
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Macroscopically, the cyst appeared to have thick walls and measured approximately 28 x 17 cm in size and containing 6 L of clear liquid ( Fig. 5 ).
Serous cystadenoma: fibrous tissue lined by mostly single-layer cuboidal or columnar serous epithelium (arrows) with tubal metaplasia. There is no ovarian tissue or mucinous epithelium. No cellular atypia (H & E x 100).
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Histopathology revealed a benign serous cystadenoma ( Fig. 6 ).